81278420

素因数分解:

$2^2\times 5^1\times {\mathrm{811}}^1\times {\mathrm{5011}}^1$

素因数の和:5831

約数の個数: 24

約数和(自身を含む): 170929248

約数和(自身を除く): 89650828

約数列:

[1, 2, 4, 5, 10, 20, 811, 1622, 3244, 4055, 5011, 8110, 10022, 16220, 20044, 25055, 50110, 100220, 4063921, 8127842, 16255684, 20319605, 40639210, 81278420]

約数ペア:

[(1, 81278420), (2, 40639210), (4, 20319605), (5, 16255684), (10, 8127842), (20, 4063921), (811, 100220), (1622, 50110), (3244, 25055), (4055, 20044), (5011, 16220), (8110, 10022)]