21901957

素因数分解:

$7^1\times {\mathrm{11}}^1\times {\mathrm{23}}^1\times {\mathrm{83}}^1\times {\mathrm{149}}^1$

素因数の和:273

約数の個数: 32

約数和(自身を含む): 29030400

約数和(自身を除く): 7128443

約数列:

[1, 7, 11, 23, 77, 83, 149, 161, 253, 581, 913, 1043, 1639, 1771, 1909, 3427, 6391, 11473, 12367, 13363, 20999, 23989, 37697, 86569, 136037, 146993, 263879, 284441, 952259, 1991087, 3128851, 21901957]

約数ペア:

[(1, 21901957), (7, 3128851), (11, 1991087), (23, 952259), (77, 284441), (83, 263879), (149, 146993), (161, 136037), (253, 86569), (581, 37697), (913, 23989), (1043, 20999), (1639, 13363), (1771, 12367), (1909, 11473), (3427, 6391)]