21173975

素因数分解:

$5^2\times {\mathrm{71}}^1\times {\mathrm{79}}^1\times {\mathrm{151}}^1$

素因数の和:311

約数の個数: 24

約数和(自身を含む): 27141120

約数和(自身を除く): 5967145

約数列:

[1, 5, 25, 71, 79, 151, 355, 395, 755, 1775, 1975, 3775, 5609, 10721, 11929, 28045, 53605, 59645, 140225, 268025, 298225, 846959, 4234795, 21173975]

約数ペア:

[(1, 21173975), (5, 4234795), (25, 846959), (71, 298225), (79, 268025), (151, 140225), (355, 59645), (395, 53605), (755, 28045), (1775, 11929), (1975, 10721), (3775, 5609)]