21271120

素因数分解:

$2^4\times 5^1\times {\mathrm{13}}^1\times {\mathrm{113}}^1\times {\mathrm{181}}^1$

素因数の和:320

約数の個数: 80

約数和(自身を含む): 54027792

約数和(自身を除く): 32756672

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 20, 26, 40, 52, 65, 80, 104, 113, 130, 181, 208, 226, 260, 362, 452, 520, 565, 724, 904, 905, 1040, 1130, 1448, 1469, 1808, 1810, 2260, 2353, 2896, 2938, 3620, 4520, 4706, 5876, 7240, 7345, 9040, 9412, 11752, 11765, 14480, 14690, 18824, 20453, 23504, 23530, 29380, 37648, 40906, 47060, 58760, 81812, 94120, 102265, 117520, 163624, 188240, 204530, 265889, 327248, 409060, 531778, 818120, 1063556, 1329445, 1636240, 2127112, 2658890, 4254224, 5317780, 10635560, 21271120]

約数ペア:

[(1, 21271120), (2, 10635560), (4, 5317780), (5, 4254224), (8, 2658890), (10, 2127112), (13, 1636240), (16, 1329445), (20, 1063556), (26, 818120), (40, 531778), (52, 409060), (65, 327248), (80, 265889), (104, 204530), (113, 188240), (130, 163624), (181, 117520), (208, 102265), (226, 94120), (260, 81812), (362, 58760), (452, 47060), (520, 40906), (565, 37648), (724, 29380), (904, 23530), (905, 23504), (1040, 20453), (1130, 18824), (1448, 14690), (1469, 14480), (1808, 11765), (1810, 11752), (2260, 9412), (2353, 9040), (2896, 7345), (2938, 7240), (3620, 5876), (4520, 4706)]