21904540

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{97}}^1\times {\mathrm{1613}}^1$

素因数の和:1726

約数の個数: 48

約数和(自身を含む): 53145792

約数和(自身を除く): 31241252

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 70, 97, 140, 194, 388, 485, 679, 970, 1358, 1613, 1940, 2716, 3226, 3395, 6452, 6790, 8065, 11291, 13580, 16130, 22582, 32260, 45164, 56455, 112910, 156461, 225820, 312922, 625844, 782305, 1095227, 1564610, 2190454, 3129220, 4380908, 5476135, 10952270, 21904540]

約数ペア:

[(1, 21904540), (2, 10952270), (4, 5476135), (5, 4380908), (7, 3129220), (10, 2190454), (14, 1564610), (20, 1095227), (28, 782305), (35, 625844), (70, 312922), (97, 225820), (140, 156461), (194, 112910), (388, 56455), (485, 45164), (679, 32260), (970, 22582), (1358, 16130), (1613, 13580), (1940, 11291), (2716, 8065), (3226, 6790), (3395, 6452)]