19881981

素因数分解:

$3^2\times 7^1\times {\mathrm{401}}^1\times {\mathrm{787}}^1$

素因数の和:1201

約数の個数: 24

約数和(自身を含む): 32944704

約数和(自身を除く): 13062723

約数列:

[1, 3, 7, 9, 21, 63, 401, 787, 1203, 2361, 2807, 3609, 5509, 7083, 8421, 16527, 25263, 49581, 315587, 946761, 2209109, 2840283, 6627327, 19881981]

約数ペア:

[(1, 19881981), (3, 6627327), (7, 2840283), (9, 2209109), (21, 946761), (63, 315587), (401, 49581), (787, 25263), (1203, 16527), (2361, 8421), (2807, 7083), (3609, 5509)]