18991648

素因数分解:

$2^5\times {\mathrm{13}}^1\times {\mathrm{71}}^1\times {\mathrm{643}}^1$

素因数の和:737

約数の個数: 48

約数和(自身を含む): 40896576

約数和(自身を除く): 21904928

約数列:

[1, 2, 4, 8, 13, 16, 26, 32, 52, 71, 104, 142, 208, 284, 416, 568, 643, 923, 1136, 1286, 1846, 2272, 2572, 3692, 5144, 7384, 8359, 10288, 14768, 16718, 20576, 29536, 33436, 45653, 66872, 91306, 133744, 182612, 267488, 365224, 593489, 730448, 1186978, 1460896, 2373956, 4747912, 9495824, 18991648]

約数ペア:

[(1, 18991648), (2, 9495824), (4, 4747912), (8, 2373956), (13, 1460896), (16, 1186978), (26, 730448), (32, 593489), (52, 365224), (71, 267488), (104, 182612), (142, 133744), (208, 91306), (284, 66872), (416, 45653), (568, 33436), (643, 29536), (923, 20576), (1136, 16718), (1286, 14768), (1846, 10288), (2272, 8359), (2572, 7384), (3692, 5144)]