21640216

素因数分解:

$2^3\times {\mathrm{13}}^1\times {\mathrm{251}}^1\times {\mathrm{829}}^1$

素因数の和:1099

約数の個数: 32

約数和(自身を含む): 43923600

約数和(自身を除く): 22283384

約数列:

[1, 2, 4, 8, 13, 26, 52, 104, 251, 502, 829, 1004, 1658, 2008, 3263, 3316, 6526, 6632, 10777, 13052, 21554, 26104, 43108, 86216, 208079, 416158, 832316, 1664632, 2705027, 5410054, 10820108, 21640216]

約数ペア:

[(1, 21640216), (2, 10820108), (4, 5410054), (8, 2705027), (13, 1664632), (26, 832316), (52, 416158), (104, 208079), (251, 86216), (502, 43108), (829, 26104), (1004, 21554), (1658, 13052), (2008, 10777), (3263, 6632), (3316, 6526)]