21420880

素因数分解:

$2^4\times 5^1\times {\mathrm{13}}^1\times {\mathrm{43}}^1\times {\mathrm{479}}^1$

素因数の和:548

約数の個数: 80

約数和(自身を含む): 54996480

約数和(自身を除く): 33575600

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 20, 26, 40, 43, 52, 65, 80, 86, 104, 130, 172, 208, 215, 260, 344, 430, 479, 520, 559, 688, 860, 958, 1040, 1118, 1720, 1916, 2236, 2395, 2795, 3440, 3832, 4472, 4790, 5590, 6227, 7664, 8944, 9580, 11180, 12454, 19160, 20597, 22360, 24908, 31135, 38320, 41194, 44720, 49816, 62270, 82388, 99632, 102985, 124540, 164776, 205970, 249080, 267761, 329552, 411940, 498160, 535522, 823880, 1071044, 1338805, 1647760, 2142088, 2677610, 4284176, 5355220, 10710440, 21420880]

約数ペア:

[(1, 21420880), (2, 10710440), (4, 5355220), (5, 4284176), (8, 2677610), (10, 2142088), (13, 1647760), (16, 1338805), (20, 1071044), (26, 823880), (40, 535522), (43, 498160), (52, 411940), (65, 329552), (80, 267761), (86, 249080), (104, 205970), (130, 164776), (172, 124540), (208, 102985), (215, 99632), (260, 82388), (344, 62270), (430, 49816), (479, 44720), (520, 41194), (559, 38320), (688, 31135), (860, 24908), (958, 22360), (1040, 20597), (1118, 19160), (1720, 12454), (1916, 11180), (2236, 9580), (2395, 8944), (2795, 7664), (3440, 6227), (3832, 5590), (4472, 4790)]