21308825

素因数分解:

$5^2\times {\mathrm{61}}^1\times {\mathrm{89}}^1\times {\mathrm{157}}^1$

素因数の和:317

約数の個数: 24

約数和(自身を含む): 27330840

約数和(自身を除く): 6022015

約数列:

[1, 5, 25, 61, 89, 157, 305, 445, 785, 1525, 2225, 3925, 5429, 9577, 13973, 27145, 47885, 69865, 135725, 239425, 349325, 852353, 4261765, 21308825]

約数ペア:

[(1, 21308825), (5, 4261765), (25, 852353), (61, 349325), (89, 239425), (157, 135725), (305, 69865), (445, 47885), (785, 27145), (1525, 13973), (2225, 9577), (3925, 5429)]