21182720

素因数分解:

$2^8\times 5^1\times {\mathrm{13}}^1\times {\mathrm{19}}^1\times {\mathrm{67}}^1$

素因数の和:120

約数の個数: 144

約数和(自身を含む): 58376640

約数和(自身を除く): 37193920

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 19, 20, 26, 32, 38, 40, 52, 64, 65, 67, 76, 80, 95, 104, 128, 130, 134, 152, 160, 190, 208, 247, 256, 260, 268, 304, 320, 335, 380, 416, 494, 520, 536, 608, 640, 670, 760, 832, 871, 988, 1040, 1072, 1216, 1235, 1273, 1280, 1340, 1520, 1664, 1742, 1976, 2080, 2144, 2432, 2470, 2546, 2680, 3040, 3328, 3484, 3952, 4160, 4288, 4355, 4864, 4940, 5092, 5360, 6080, 6365, 6968, 7904, 8320, 8576, 8710, 9880, 10184, 10720, 12160, 12730, 13936, 15808, 16549, 16640, 17152, 17420, 19760, 20368, 21440, 24320, 25460, 27872, 31616, 33098, 34840, 39520, 40736, 42880, 50920, 55744, 63232, 66196, 69680, 79040, 81472, 82745, 85760, 101840, 111488, 132392, 139360, 158080, 162944, 165490, 203680, 222976, 264784, 278720, 316160, 325888, 330980, 407360, 529568, 557440, 661960, 814720, 1059136, 1114880, 1323920, 1629440, 2118272, 2647840, 4236544, 5295680, 10591360, 21182720]

約数ペア:

[(1, 21182720), (2, 10591360), (4, 5295680), (5, 4236544), (8, 2647840), (10, 2118272), (13, 1629440), (16, 1323920), (19, 1114880), (20, 1059136), (26, 814720), (32, 661960), (38, 557440), (40, 529568), (52, 407360), (64, 330980), (65, 325888), (67, 316160), (76, 278720), (80, 264784), (95, 222976), (104, 203680), (128, 165490), (130, 162944), (134, 158080), (152, 139360), (160, 132392), (190, 111488), (208, 101840), (247, 85760), (256, 82745), (260, 81472), (268, 79040), (304, 69680), (320, 66196), (335, 63232), (380, 55744), (416, 50920), (494, 42880), (520, 40736), (536, 39520), (608, 34840), (640, 33098), (670, 31616), (760, 27872), (832, 25460), (871, 24320), (988, 21440), (1040, 20368), (1072, 19760), (1216, 17420), (1235, 17152), (1273, 16640), (1280, 16549), (1340, 15808), (1520, 13936), (1664, 12730), (1742, 12160), (1976, 10720), (2080, 10184), (2144, 9880), (2432, 8710), (2470, 8576), (2546, 8320), (2680, 7904), (3040, 6968), (3328, 6365), (3484, 6080), (3952, 5360), (4160, 5092), (4288, 4940), (4355, 4864)]