21990773

素因数分解:

$7^1\times {\mathrm{97}}^1\times {\mathrm{139}}^1\times {\mathrm{233}}^1$

素因数の和:476

約数の個数: 16

約数和(自身を含む): 25683840

約数和(自身を除く): 3693067

約数列:

[1, 7, 97, 139, 233, 679, 973, 1631, 13483, 22601, 32387, 94381, 158207, 226709, 3141539, 21990773]

約数ペア:

[(1, 21990773), (7, 3141539), (97, 226709), (139, 158207), (233, 94381), (679, 32387), (973, 22601), (1631, 13483)]