21640825

素因数分解:

$5^2\times {\mathrm{41}}^1\times {\mathrm{43}}^1\times {\mathrm{491}}^1$

素因数の和:585

約数の個数: 24

約数和(自身を含む): 28185696

約数和(自身を除く): 6544871

約数列:

[1, 5, 25, 41, 43, 205, 215, 491, 1025, 1075, 1763, 2455, 8815, 12275, 20131, 21113, 44075, 100655, 105565, 503275, 527825, 865633, 4328165, 21640825]

約数ペア:

[(1, 21640825), (5, 4328165), (25, 865633), (41, 527825), (43, 503275), (205, 105565), (215, 100655), (491, 44075), (1025, 21113), (1075, 20131), (1763, 12275), (2455, 8815)]