21131825

素因数分解:

$5^2\times {\mathrm{11}}^1\times {\mathrm{13}}^1\times {\mathrm{23}}^1\times {\mathrm{257}}^1$

素因数の和:314

約数の個数: 48

約数和(自身を含む): 32247936

約数和(自身を除く): 11116111

約数列:

[1, 5, 11, 13, 23, 25, 55, 65, 115, 143, 253, 257, 275, 299, 325, 575, 715, 1265, 1285, 1495, 2827, 3289, 3341, 3575, 5911, 6325, 6425, 7475, 14135, 16445, 16705, 29555, 36751, 65021, 70675, 76843, 82225, 83525, 147775, 183755, 325105, 384215, 845273, 918775, 1625525, 1921075, 4226365, 21131825]

約数ペア:

[(1, 21131825), (5, 4226365), (11, 1921075), (13, 1625525), (23, 918775), (25, 845273), (55, 384215), (65, 325105), (115, 183755), (143, 147775), (253, 83525), (257, 82225), (275, 76843), (299, 70675), (325, 65021), (575, 36751), (715, 29555), (1265, 16705), (1285, 16445), (1495, 14135), (2827, 7475), (3289, 6425), (3341, 6325), (3575, 5911)]