21187509

素因数分解:

$3^1\times 7^1\times {\mathrm{659}}^1\times {\mathrm{1531}}^1$

素因数の和:2200

約数の個数: 16

約数和(自身を含む): 32355840

約数和(自身を除く): 11168331

約数列:

[1, 3, 7, 21, 659, 1531, 1977, 4593, 4613, 10717, 13839, 32151, 1008929, 3026787, 7062503, 21187509]

約数ペア:

[(1, 21187509), (3, 7062503), (7, 3026787), (21, 1008929), (659, 32151), (1531, 13839), (1977, 10717), (4593, 4613)]