21040975

素因数分解:

$5^2\times {\mathrm{23}}^2\times {\mathrm{37}}^1\times {\mathrm{43}}^1$

素因数の和:136

約数の個数: 36

約数和(自身を含む): 28663096

約数和(自身を除く): 7622121

約数列:

[1, 5, 23, 25, 37, 43, 115, 185, 215, 529, 575, 851, 925, 989, 1075, 1591, 2645, 4255, 4945, 7955, 13225, 19573, 21275, 22747, 24725, 36593, 39775, 97865, 113735, 182965, 489325, 568675, 841639, 914825, 4208195, 21040975]

約数ペア:

[(1, 21040975), (5, 4208195), (23, 914825), (25, 841639), (37, 568675), (43, 489325), (115, 182965), (185, 113735), (215, 97865), (529, 39775), (575, 36593), (851, 24725), (925, 22747), (989, 21275), (1075, 19573), (1591, 13225), (2645, 7955), (4255, 4945)]