21405880

素因数分解:

$2^3\times 5^1\times {\mathrm{457}}^1\times {\mathrm{1171}}^1$

素因数の和:1639

約数の個数: 32

約数和(自身を含む): 48309840

約数和(自身を除く): 26903960

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 457, 914, 1171, 1828, 2285, 2342, 3656, 4570, 4684, 5855, 9140, 9368, 11710, 18280, 23420, 46840, 535147, 1070294, 2140588, 2675735, 4281176, 5351470, 10702940, 21405880]

約数ペア:

[(1, 21405880), (2, 10702940), (4, 5351470), (5, 4281176), (8, 2675735), (10, 2140588), (20, 1070294), (40, 535147), (457, 46840), (914, 23420), (1171, 18280), (1828, 11710), (2285, 9368), (2342, 9140), (3656, 5855), (4570, 4684)]