20655920

素因数分解:

$2^4\times 5^1\times {\mathrm{31}}^1\times {\mathrm{8329}}^1$

素因数の和:8373

約数の個数: 40

約数和(自身を含む): 49580160

約数和(自身を除く): 28924240

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 31, 40, 62, 80, 124, 155, 248, 310, 496, 620, 1240, 2480, 8329, 16658, 33316, 41645, 66632, 83290, 133264, 166580, 258199, 333160, 516398, 666320, 1032796, 1290995, 2065592, 2581990, 4131184, 5163980, 10327960, 20655920]

約数ペア:

[(1, 20655920), (2, 10327960), (4, 5163980), (5, 4131184), (8, 2581990), (10, 2065592), (16, 1290995), (20, 1032796), (31, 666320), (40, 516398), (62, 333160), (80, 258199), (124, 166580), (155, 133264), (248, 83290), (310, 66632), (496, 41645), (620, 33316), (1240, 16658), (2480, 8329)]