21040825

素因数分解:

$5^2\times {\mathrm{13}}^1\times {\mathrm{101}}^1\times {\mathrm{641}}^1$

素因数の和:765

約数の個数: 24

約数和(自身を含む): 28420056

約数和(自身を除く): 7379231

約数列:

[1, 5, 13, 25, 65, 101, 325, 505, 641, 1313, 2525, 3205, 6565, 8333, 16025, 32825, 41665, 64741, 208325, 323705, 841633, 1618525, 4208165, 21040825]

約数ペア:

[(1, 21040825), (5, 4208165), (13, 1618525), (25, 841633), (65, 323705), (101, 208325), (325, 64741), (505, 41665), (641, 32825), (1313, 16025), (2525, 8333), (3205, 6565)]