21247525

素因数分解:

$5^2\times {\mathrm{13}}^2\times {\mathrm{47}}^1\times {\mathrm{107}}^1$

素因数の和:190

約数の個数: 36

約数和(自身を含む): 29408832

約数和(自身を除く): 8161307

約数列:

[1, 5, 13, 25, 47, 65, 107, 169, 235, 325, 535, 611, 845, 1175, 1391, 2675, 3055, 4225, 5029, 6955, 7943, 15275, 18083, 25145, 34775, 39715, 65377, 90415, 125725, 198575, 326885, 452075, 849901, 1634425, 4249505, 21247525]

約数ペア:

[(1, 21247525), (5, 4249505), (13, 1634425), (25, 849901), (47, 452075), (65, 326885), (107, 198575), (169, 125725), (235, 90415), (325, 65377), (535, 39715), (611, 34775), (845, 25145), (1175, 18083), (1391, 15275), (2675, 7943), (3055, 6955), (4225, 5029)]