20395520

素因数分解:

$2^9\times 5^1\times {\mathrm{31}}^1\times {\mathrm{257}}^1$

素因数の和:311

約数の個数: 80

約数和(自身を含む): 50675328

約数和(自身を除く): 30279808

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 31, 32, 40, 62, 64, 80, 124, 128, 155, 160, 248, 256, 257, 310, 320, 496, 512, 514, 620, 640, 992, 1028, 1240, 1280, 1285, 1984, 2056, 2480, 2560, 2570, 3968, 4112, 4960, 5140, 7936, 7967, 8224, 9920, 10280, 15872, 15934, 16448, 19840, 20560, 31868, 32896, 39680, 39835, 41120, 63736, 65792, 79360, 79670, 82240, 127472, 131584, 159340, 164480, 254944, 318680, 328960, 509888, 637360, 657920, 1019776, 1274720, 2039552, 2549440, 4079104, 5098880, 10197760, 20395520]

約数ペア:

[(1, 20395520), (2, 10197760), (4, 5098880), (5, 4079104), (8, 2549440), (10, 2039552), (16, 1274720), (20, 1019776), (31, 657920), (32, 637360), (40, 509888), (62, 328960), (64, 318680), (80, 254944), (124, 164480), (128, 159340), (155, 131584), (160, 127472), (248, 82240), (256, 79670), (257, 79360), (310, 65792), (320, 63736), (496, 41120), (512, 39835), (514, 39680), (620, 32896), (640, 31868), (992, 20560), (1028, 19840), (1240, 16448), (1280, 15934), (1285, 15872), (1984, 10280), (2056, 9920), (2480, 8224), (2560, 7967), (2570, 7936), (3968, 5140), (4112, 4960)]