21151780

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^1\times {\mathrm{81353}}^1$

素因数の和:81375

約数の個数: 24

約数和(自身を含む): 47836152

約数和(自身を除く): 26684372

約数列:

[1, 2, 4, 5, 10, 13, 20, 26, 52, 65, 130, 260, 81353, 162706, 325412, 406765, 813530, 1057589, 1627060, 2115178, 4230356, 5287945, 10575890, 21151780]

約数ペア:

[(1, 21151780), (2, 10575890), (4, 5287945), (5, 4230356), (10, 2115178), (13, 1627060), (20, 1057589), (26, 813530), (52, 406765), (65, 325412), (130, 162706), (260, 81353)]