20637968

素因数分解:

$2^4\times {\mathrm{13}}^1\times {\mathrm{313}}^1\times {\mathrm{317}}^1$

素因数の和:651

約数の個数: 40

約数和(自身を含む): 43335768

約数和(自身を除く): 22697800

約数列:

[1, 2, 4, 8, 13, 16, 26, 52, 104, 208, 313, 317, 626, 634, 1252, 1268, 2504, 2536, 4069, 4121, 5008, 5072, 8138, 8242, 16276, 16484, 32552, 32968, 65104, 65936, 99221, 198442, 396884, 793768, 1289873, 1587536, 2579746, 5159492, 10318984, 20637968]

約数ペア:

[(1, 20637968), (2, 10318984), (4, 5159492), (8, 2579746), (13, 1587536), (16, 1289873), (26, 793768), (52, 396884), (104, 198442), (208, 99221), (313, 65936), (317, 65104), (626, 32968), (634, 32552), (1252, 16484), (1268, 16276), (2504, 8242), (2536, 8138), (4069, 5072), (4121, 5008)]