640988

素因数分解:

$2^2\times {\mathrm{37}}^1\times {\mathrm{61}}^1\times {\mathrm{71}}^1$

素因数の和:173

約数の個数: 24

約数和(自身を含む): 1187424

約数和(自身を除く): 546436

約数列:

[1, 2, 4, 37, 61, 71, 74, 122, 142, 148, 244, 284, 2257, 2627, 4331, 4514, 5254, 8662, 9028, 10508, 17324, 160247, 320494, 640988]

約数ペア:

[(1, 640988), (2, 320494), (4, 160247), (37, 17324), (61, 10508), (71, 9028), (74, 8662), (122, 5254), (142, 4514), (148, 4331), (244, 2627), (284, 2257)]