81358280

素因数分解:

$2^3\times 5^1\times {\mathrm{409}}^1\times {\mathrm{4973}}^1$

素因数の和:5393

約数の個数: 32

約数和(自身を含む): 183540600

約数和(自身を除く): 102182320

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 409, 818, 1636, 2045, 3272, 4090, 4973, 8180, 9946, 16360, 19892, 24865, 39784, 49730, 99460, 198920, 2033957, 4067914, 8135828, 10169785, 16271656, 20339570, 40679140, 81358280]

約数ペア:

[(1, 81358280), (2, 40679140), (4, 20339570), (5, 16271656), (8, 10169785), (10, 8135828), (20, 4067914), (40, 2033957), (409, 198920), (818, 99460), (1636, 49730), (2045, 39784), (3272, 24865), (4090, 19892), (4973, 16360), (8180, 9946)]