21128205

素因数分解:

$3^1\times 5^1\times 7^1\times {\mathrm{31}}^1\times {\mathrm{6491}}^1$

素因数の和:6537

約数の個数: 32

約数和(自身を含む): 39886848

約数和(自身を除く): 18758643

約数列:

[1, 3, 5, 7, 15, 21, 31, 35, 93, 105, 155, 217, 465, 651, 1085, 3255, 6491, 19473, 32455, 45437, 97365, 136311, 201221, 227185, 603663, 681555, 1006105, 1408547, 3018315, 4225641, 7042735, 21128205]

約数ペア:

[(1, 21128205), (3, 7042735), (5, 4225641), (7, 3018315), (15, 1408547), (21, 1006105), (31, 681555), (35, 603663), (93, 227185), (105, 201221), (155, 136311), (217, 97365), (465, 45437), (651, 32455), (1085, 19473), (3255, 6491)]