20505625

素因数分解:

$5^4\times 7^1\times {\mathrm{43}}^1\times {\mathrm{109}}^1$

素因数の和:179

約数の個数: 40

約数和(自身を含む): 30240320

約数和(自身を除く): 9734695

約数列:

[1, 5, 7, 25, 35, 43, 109, 125, 175, 215, 301, 545, 625, 763, 875, 1075, 1505, 2725, 3815, 4375, 4687, 5375, 7525, 13625, 19075, 23435, 26875, 32809, 37625, 68125, 95375, 117175, 164045, 188125, 476875, 585875, 820225, 2929375, 4101125, 20505625]

約数ペア:

[(1, 20505625), (5, 4101125), (7, 2929375), (25, 820225), (35, 585875), (43, 476875), (109, 188125), (125, 164045), (175, 117175), (215, 95375), (301, 68125), (545, 37625), (625, 32809), (763, 26875), (875, 23435), (1075, 19075), (1505, 13625), (2725, 7525), (3815, 5375), (4375, 4687)]