20970625

素因数分解:

$5^4\times {\mathrm{13}}^1\times {\mathrm{29}}^1\times {\mathrm{89}}^1$

素因数の和:151

約数の個数: 40

約数和(自身を含む): 29521800

約数和(自身を除く): 8551175

約数列:

[1, 5, 13, 25, 29, 65, 89, 125, 145, 325, 377, 445, 625, 725, 1157, 1625, 1885, 2225, 2581, 3625, 5785, 8125, 9425, 11125, 12905, 18125, 28925, 33553, 47125, 55625, 64525, 144625, 167765, 235625, 322625, 723125, 838825, 1613125, 4194125, 20970625]

約数ペア:

[(1, 20970625), (5, 4194125), (13, 1613125), (25, 838825), (29, 723125), (65, 322625), (89, 235625), (125, 167765), (145, 144625), (325, 64525), (377, 55625), (445, 47125), (625, 33553), (725, 28925), (1157, 18125), (1625, 12905), (1885, 11125), (2225, 9425), (2581, 8125), (3625, 5785)]