21162520

素因数分解:

$2^3\times 5^1\times {\mathrm{37}}^1\times {\mathrm{79}}^1\times {\mathrm{181}}^1$

素因数の和:308

約数の個数: 64

約数和(自身を含む): 49795200

約数和(自身を除く): 28632680

約数列:

[1, 2, 4, 5, 8, 10, 20, 37, 40, 74, 79, 148, 158, 181, 185, 296, 316, 362, 370, 395, 632, 724, 740, 790, 905, 1448, 1480, 1580, 1810, 2923, 3160, 3620, 5846, 6697, 7240, 11692, 13394, 14299, 14615, 23384, 26788, 28598, 29230, 33485, 53576, 57196, 58460, 66970, 71495, 114392, 116920, 133940, 142990, 267880, 285980, 529063, 571960, 1058126, 2116252, 2645315, 4232504, 5290630, 10581260, 21162520]

約数ペア:

[(1, 21162520), (2, 10581260), (4, 5290630), (5, 4232504), (8, 2645315), (10, 2116252), (20, 1058126), (37, 571960), (40, 529063), (74, 285980), (79, 267880), (148, 142990), (158, 133940), (181, 116920), (185, 114392), (296, 71495), (316, 66970), (362, 58460), (370, 57196), (395, 53576), (632, 33485), (724, 29230), (740, 28598), (790, 26788), (905, 23384), (1448, 14615), (1480, 14299), (1580, 13394), (1810, 11692), (2923, 7240), (3160, 6697), (3620, 5846)]