21553025

素因数分解:

$5^2\times {\mathrm{13}}^1\times {\mathrm{17}}^1\times {\mathrm{47}}^1\times {\mathrm{83}}^1$

素因数の和:170

約数の個数: 48

約数和(自身を含む): 31497984

約数和(自身を除く): 9944959

約数列:

[1, 5, 13, 17, 25, 47, 65, 83, 85, 221, 235, 325, 415, 425, 611, 799, 1079, 1105, 1175, 1411, 2075, 3055, 3901, 3995, 5395, 5525, 7055, 10387, 15275, 18343, 19505, 19975, 26975, 35275, 50713, 51935, 66317, 91715, 97525, 253565, 259675, 331585, 458575, 862121, 1267825, 1657925, 4310605, 21553025]

約数ペア:

[(1, 21553025), (5, 4310605), (13, 1657925), (17, 1267825), (25, 862121), (47, 458575), (65, 331585), (83, 259675), (85, 253565), (221, 97525), (235, 91715), (325, 66317), (415, 51935), (425, 50713), (611, 35275), (799, 26975), (1079, 19975), (1105, 19505), (1175, 18343), (1411, 15275), (2075, 10387), (3055, 7055), (3901, 5525), (3995, 5395)]