21355245

素因数分解:

$3^4\times 5^1\times {\mathrm{67}}^1\times {\mathrm{787}}^1$

素因数の和:871

約数の個数: 40

約数和(自身を含む): 38901984

約数和(自身を除く): 17546739

約数列:

[1, 3, 5, 9, 15, 27, 45, 67, 81, 135, 201, 335, 405, 603, 787, 1005, 1809, 2361, 3015, 3935, 5427, 7083, 9045, 11805, 21249, 27135, 35415, 52729, 63747, 106245, 158187, 263645, 318735, 474561, 790935, 1423683, 2372805, 4271049, 7118415, 21355245]

約数ペア:

[(1, 21355245), (3, 7118415), (5, 4271049), (9, 2372805), (15, 1423683), (27, 790935), (45, 474561), (67, 318735), (81, 263645), (135, 158187), (201, 106245), (335, 63747), (405, 52729), (603, 35415), (787, 27135), (1005, 21249), (1809, 11805), (2361, 9045), (3015, 7083), (3935, 5427)]