21572005

素因数分解:

$5^1\times 7^2\times {\mathrm{13}}^2\times {\mathrm{521}}^1$

素因数の和:566

約数の個数: 36

約数和(自身を含む): 32669892

約数和(自身を除く): 11097887

約数列:

[1, 5, 7, 13, 35, 49, 65, 91, 169, 245, 455, 521, 637, 845, 1183, 2605, 3185, 3647, 5915, 6773, 8281, 18235, 25529, 33865, 41405, 47411, 88049, 127645, 237055, 331877, 440245, 616343, 1659385, 3081715, 4314401, 21572005]

約数ペア:

[(1, 21572005), (5, 4314401), (7, 3081715), (13, 1659385), (35, 616343), (49, 440245), (65, 331877), (91, 237055), (169, 127645), (245, 88049), (455, 47411), (521, 41405), (637, 33865), (845, 25529), (1183, 18235), (2605, 8281), (3185, 6773), (3647, 5915)]