21387640

素因数分解:

$2^3\times 5^1\times {\mathrm{151}}^1\times {\mathrm{3541}}^1$

素因数の和:3703

約数の個数: 32

約数和(自身を含む): 48454560

約数和(自身を除く): 27066920

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 151, 302, 604, 755, 1208, 1510, 3020, 3541, 6040, 7082, 14164, 17705, 28328, 35410, 70820, 141640, 534691, 1069382, 2138764, 2673455, 4277528, 5346910, 10693820, 21387640]

約数ペア:

[(1, 21387640), (2, 10693820), (4, 5346910), (5, 4277528), (8, 2673455), (10, 2138764), (20, 1069382), (40, 534691), (151, 141640), (302, 70820), (604, 35410), (755, 28328), (1208, 17705), (1510, 14164), (3020, 7082), (3541, 6040)]