21406720

素因数分解:

$2^{10}\times 5^1\times {\mathrm{37}}^1\times {\mathrm{113}}^1$

素因数の和:175

約数の個数: 88

約数和(自身を含む): 53205624

約数和(自身を除く): 31798904

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 37, 40, 64, 74, 80, 113, 128, 148, 160, 185, 226, 256, 296, 320, 370, 452, 512, 565, 592, 640, 740, 904, 1024, 1130, 1184, 1280, 1480, 1808, 2260, 2368, 2560, 2960, 3616, 4181, 4520, 4736, 5120, 5920, 7232, 8362, 9040, 9472, 11840, 14464, 16724, 18080, 18944, 20905, 23680, 28928, 33448, 36160, 37888, 41810, 47360, 57856, 66896, 72320, 83620, 94720, 115712, 133792, 144640, 167240, 189440, 267584, 289280, 334480, 535168, 578560, 668960, 1070336, 1337920, 2140672, 2675840, 4281344, 5351680, 10703360, 21406720]

約数ペア:

[(1, 21406720), (2, 10703360), (4, 5351680), (5, 4281344), (8, 2675840), (10, 2140672), (16, 1337920), (20, 1070336), (32, 668960), (37, 578560), (40, 535168), (64, 334480), (74, 289280), (80, 267584), (113, 189440), (128, 167240), (148, 144640), (160, 133792), (185, 115712), (226, 94720), (256, 83620), (296, 72320), (320, 66896), (370, 57856), (452, 47360), (512, 41810), (565, 37888), (592, 36160), (640, 33448), (740, 28928), (904, 23680), (1024, 20905), (1130, 18944), (1184, 18080), (1280, 16724), (1480, 14464), (1808, 11840), (2260, 9472), (2368, 9040), (2560, 8362), (2960, 7232), (3616, 5920), (4181, 5120), (4520, 4736)]