638240

素因数分解:

$2^5\times 5^1\times {\mathrm{3989}}^1$

素因数の和:4004

約数の個数: 24

約数和(自身を含む): 1508220

約数和(自身を除く): 869980

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 80, 160, 3989, 7978, 15956, 19945, 31912, 39890, 63824, 79780, 127648, 159560, 319120, 638240]

約数ペア:

[(1, 638240), (2, 319120), (4, 159560), (5, 127648), (8, 79780), (10, 63824), (16, 39890), (20, 31912), (32, 19945), (40, 15956), (80, 7978), (160, 3989)]