20905640

素因数分解:

$2^3\times 5^1\times 7^1\times {\mathrm{197}}^1\times {\mathrm{379}}^1$

素因数の和:594

約数の個数: 64

約数和(自身を含む): 54172800

約数和(自身を除く): 33267160

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 20, 28, 35, 40, 56, 70, 140, 197, 280, 379, 394, 758, 788, 985, 1379, 1516, 1576, 1895, 1970, 2653, 2758, 3032, 3790, 3940, 5306, 5516, 6895, 7580, 7880, 10612, 11032, 13265, 13790, 15160, 21224, 26530, 27580, 53060, 55160, 74663, 106120, 149326, 298652, 373315, 522641, 597304, 746630, 1045282, 1493260, 2090564, 2613205, 2986520, 4181128, 5226410, 10452820, 20905640]

約数ペア:

[(1, 20905640), (2, 10452820), (4, 5226410), (5, 4181128), (7, 2986520), (8, 2613205), (10, 2090564), (14, 1493260), (20, 1045282), (28, 746630), (35, 597304), (40, 522641), (56, 373315), (70, 298652), (140, 149326), (197, 106120), (280, 74663), (379, 55160), (394, 53060), (758, 27580), (788, 26530), (985, 21224), (1379, 15160), (1516, 13790), (1576, 13265), (1895, 11032), (1970, 10612), (2653, 7880), (2758, 7580), (3032, 6895), (3790, 5516), (3940, 5306)]