21579025

素因数分解:

$5^2\times {\mathrm{13}}^1\times {\mathrm{67}}^1\times {\mathrm{991}}^1$

素因数の和:1081

約数の個数: 24

約数和(自身を含む): 29275904

約数和(自身を除く): 7696879

約数列:

[1, 5, 13, 25, 65, 67, 325, 335, 871, 991, 1675, 4355, 4955, 12883, 21775, 24775, 64415, 66397, 322075, 331985, 863161, 1659925, 4315805, 21579025]

約数ペア:

[(1, 21579025), (5, 4315805), (13, 1659925), (25, 863161), (65, 331985), (67, 322075), (325, 66397), (335, 64415), (871, 24775), (991, 21775), (1675, 12883), (4355, 4955)]