19997744

素因数分解:

$2^4\times {\mathrm{13}}^1\times {\mathrm{79}}^1\times {\mathrm{1217}}^1$

素因数の和:1317

約数の個数: 40

約数和(自身を含む): 42288960

約数和(自身を除く): 22291216

約数列:

[1, 2, 4, 8, 13, 16, 26, 52, 79, 104, 158, 208, 316, 632, 1027, 1217, 1264, 2054, 2434, 4108, 4868, 8216, 9736, 15821, 16432, 19472, 31642, 63284, 96143, 126568, 192286, 253136, 384572, 769144, 1249859, 1538288, 2499718, 4999436, 9998872, 19997744]

約数ペア:

[(1, 19997744), (2, 9998872), (4, 4999436), (8, 2499718), (13, 1538288), (16, 1249859), (26, 769144), (52, 384572), (79, 253136), (104, 192286), (158, 126568), (208, 96143), (316, 63284), (632, 31642), (1027, 19472), (1217, 16432), (1264, 15821), (2054, 9736), (2434, 8216), (4108, 4868)]