21787858

素因数分解:

$2^1\times {\mathrm{61}}^1\times {\mathrm{271}}^1\times {\mathrm{659}}^1$

素因数の和:993

約数の個数: 16

約数和(自身を含む): 33390720

約数和(自身を除く): 11602862

約数列:

[1, 2, 61, 122, 271, 542, 659, 1318, 16531, 33062, 40199, 80398, 178589, 357178, 10893929, 21787858]

約数ペア:

[(1, 21787858), (2, 10893929), (61, 357178), (122, 178589), (271, 80398), (542, 40199), (659, 33062), (1318, 16531)]