21891075

素因数分解:

$3^1\times 5^2\times {\mathrm{71}}^1\times {\mathrm{4111}}^1$

素因数の和:4195

約数の個数: 24

約数和(自身を含む): 36711936

約数和(自身を除く): 14820861

約数列:

[1, 3, 5, 15, 25, 71, 75, 213, 355, 1065, 1775, 4111, 5325, 12333, 20555, 61665, 102775, 291881, 308325, 875643, 1459405, 4378215, 7297025, 21891075]

約数ペア:

[(1, 21891075), (3, 7297025), (5, 4378215), (15, 1459405), (25, 875643), (71, 308325), (75, 291881), (213, 102775), (355, 61665), (1065, 20555), (1775, 12333), (4111, 5325)]