20918080

素因数分解:

$2^6\times 5^1\times {\mathrm{131}}^1\times {\mathrm{499}}^1$

素因数の和:647

約数の個数: 56

約数和(自身を含む): 50292000

約数和(自身を除く): 29373920

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 80, 131, 160, 262, 320, 499, 524, 655, 998, 1048, 1310, 1996, 2096, 2495, 2620, 3992, 4192, 4990, 5240, 7984, 8384, 9980, 10480, 15968, 19960, 20960, 31936, 39920, 41920, 65369, 79840, 130738, 159680, 261476, 326845, 522952, 653690, 1045904, 1307380, 2091808, 2614760, 4183616, 5229520, 10459040, 20918080]

約数ペア:

[(1, 20918080), (2, 10459040), (4, 5229520), (5, 4183616), (8, 2614760), (10, 2091808), (16, 1307380), (20, 1045904), (32, 653690), (40, 522952), (64, 326845), (80, 261476), (131, 159680), (160, 130738), (262, 79840), (320, 65369), (499, 41920), (524, 39920), (655, 31936), (998, 20960), (1048, 19960), (1310, 15968), (1996, 10480), (2096, 9980), (2495, 8384), (2620, 7984), (3992, 5240), (4192, 4990)]