21636640

素因数分解:

$2^5\times 5^1\times {\mathrm{271}}^1\times {\mathrm{499}}^1$

素因数の和:785

約数の個数: 48

約数和(自身を含む): 51408000

約数和(自身を除く): 29771360

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 80, 160, 271, 499, 542, 998, 1084, 1355, 1996, 2168, 2495, 2710, 3992, 4336, 4990, 5420, 7984, 8672, 9980, 10840, 15968, 19960, 21680, 39920, 43360, 79840, 135229, 270458, 540916, 676145, 1081832, 1352290, 2163664, 2704580, 4327328, 5409160, 10818320, 21636640]

約数ペア:

[(1, 21636640), (2, 10818320), (4, 5409160), (5, 4327328), (8, 2704580), (10, 2163664), (16, 1352290), (20, 1081832), (32, 676145), (40, 540916), (80, 270458), (160, 135229), (271, 79840), (499, 43360), (542, 39920), (998, 21680), (1084, 19960), (1355, 15968), (1996, 10840), (2168, 9980), (2495, 8672), (2710, 7984), (3992, 5420), (4336, 4990)]