689969680

素因数分解:

$2^4\times 5^1\times {\mathrm{8624621}}^1$

素因数の和:8624634

約数の個数: 20

約数和(自身を含む): 1604179692

約数和(自身を除く): 914210012

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 8624621, 17249242, 34498484, 43123105, 68996968, 86246210, 137993936, 172492420, 344984840, 689969680]

約数ペア:

[(1, 689969680), (2, 344984840), (4, 172492420), (5, 137993936), (8, 86246210), (10, 68996968), (16, 43123105), (20, 34498484), (40, 17249242), (80, 8624621)]