644150

素因数分解:

$2^1\times 5^2\times {\mathrm{13}}^1\times {\mathrm{991}}^1$

素因数の和:1016

約数の個数: 24

約数和(自身を含む): 1291584

約数和(自身を除く): 647434

約数列:

[1, 2, 5, 10, 13, 25, 26, 50, 65, 130, 325, 650, 991, 1982, 4955, 9910, 12883, 24775, 25766, 49550, 64415, 128830, 322075, 644150]

約数ペア:

[(1, 644150), (2, 322075), (5, 128830), (10, 64415), (13, 49550), (25, 25766), (26, 24775), (50, 12883), (65, 9910), (130, 4955), (325, 1982), (650, 991)]