21307960

素因数分解:

$2^3\times 5^1\times {\mathrm{191}}^1\times {\mathrm{2789}}^1$

素因数の和:2991

約数の個数: 32

約数和(自身を含む): 48211200

約数和(自身を除く): 26903240

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 191, 382, 764, 955, 1528, 1910, 2789, 3820, 5578, 7640, 11156, 13945, 22312, 27890, 55780, 111560, 532699, 1065398, 2130796, 2663495, 4261592, 5326990, 10653980, 21307960]

約数ペア:

[(1, 21307960), (2, 10653980), (4, 5326990), (5, 4261592), (8, 2663495), (10, 2130796), (20, 1065398), (40, 532699), (191, 111560), (382, 55780), (764, 27890), (955, 22312), (1528, 13945), (1910, 11156), (2789, 7640), (3820, 5578)]