20091025

素因数分解:

$5^2\times {\mathrm{17}}^1\times {\mathrm{41}}^1\times {\mathrm{1153}}^1$

素因数の和:1221

約数の個数: 24

約数和(自身を含む): 27045144

約数和(自身を除く): 6954119

約数列:

[1, 5, 17, 25, 41, 85, 205, 425, 697, 1025, 1153, 3485, 5765, 17425, 19601, 28825, 47273, 98005, 236365, 490025, 803641, 1181825, 4018205, 20091025]

約数ペア:

[(1, 20091025), (5, 4018205), (17, 1181825), (25, 803641), (41, 490025), (85, 236365), (205, 98005), (425, 47273), (697, 28825), (1025, 19601), (1153, 17425), (3485, 5765)]