21220977

素因数分解:

$3^1\times {\mathrm{67}}^1\times {\mathrm{71}}^1\times {\mathrm{1487}}^1$

素因数の和:1628

約数の個数: 16

約数和(自身を含む): 29140992

約数和(自身を除く): 7920015

約数列:

[1, 3, 67, 71, 201, 213, 1487, 4461, 4757, 14271, 99629, 105577, 298887, 316731, 7073659, 21220977]

約数ペア:

[(1, 21220977), (3, 7073659), (67, 316731), (71, 298887), (201, 105577), (213, 99629), (1487, 14271), (4461, 4757)]