21315920

素因数分解:

$2^4\times 5^1\times {\mathrm{266449}}^1$

素因数の和:266462

約数の個数: 20

約数和(自身を含む): 49559700

約数和(自身を除く): 28243780

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 266449, 532898, 1065796, 1332245, 2131592, 2664490, 4263184, 5328980, 10657960, 21315920]

約数ペア:

[(1, 21315920), (2, 10657960), (4, 5328980), (5, 4263184), (8, 2664490), (10, 2131592), (16, 1332245), (20, 1065796), (40, 532898), (80, 266449)]