20129575

素因数分解:

$5^2\times {\mathrm{83}}^1\times {\mathrm{89}}^1\times {\mathrm{109}}^1$

素因数の和:291

約数の個数: 24

約数和(自身を含む): 25779600

約数和(自身を除く): 5650025

約数列:

[1, 5, 25, 83, 89, 109, 415, 445, 545, 2075, 2225, 2725, 7387, 9047, 9701, 36935, 45235, 48505, 184675, 226175, 242525, 805183, 4025915, 20129575]

約数ペア:

[(1, 20129575), (5, 4025915), (25, 805183), (83, 242525), (89, 226175), (109, 184675), (415, 48505), (445, 45235), (545, 36935), (2075, 9701), (2225, 9047), (2725, 7387)]