21597820

素因数分解:

$2^2\times 5^1\times {\mathrm{17}}^1\times {\mathrm{139}}^1\times {\mathrm{457}}^1$

素因数の和:622

約数の個数: 48

約数和(自身を含む): 48474720

約数和(自身を除く): 26876900

約数列:

[1, 2, 4, 5, 10, 17, 20, 34, 68, 85, 139, 170, 278, 340, 457, 556, 695, 914, 1390, 1828, 2285, 2363, 2780, 4570, 4726, 7769, 9140, 9452, 11815, 15538, 23630, 31076, 38845, 47260, 63523, 77690, 127046, 155380, 254092, 317615, 635230, 1079891, 1270460, 2159782, 4319564, 5399455, 10798910, 21597820]

約数ペア:

[(1, 21597820), (2, 10798910), (4, 5399455), (5, 4319564), (10, 2159782), (17, 1270460), (20, 1079891), (34, 635230), (68, 317615), (85, 254092), (139, 155380), (170, 127046), (278, 77690), (340, 63523), (457, 47260), (556, 38845), (695, 31076), (914, 23630), (1390, 15538), (1828, 11815), (2285, 9452), (2363, 9140), (2780, 7769), (4570, 4726)]