21287890

素因数分解:

$2^1\times 5^1\times {\mathrm{13}}^1\times {\mathrm{163753}}^1$

素因数の和:163773

約数の個数: 16

約数和(自身を含む): 41266008

約数和(自身を除く): 19978118

約数列:

[1, 2, 5, 10, 13, 26, 65, 130, 163753, 327506, 818765, 1637530, 2128789, 4257578, 10643945, 21287890]

約数ペア:

[(1, 21287890), (2, 10643945), (5, 4257578), (10, 2128789), (13, 1637530), (26, 818765), (65, 327506), (130, 163753)]