639844900

素因数分解:

$2^2\times 5^2\times {\mathrm{71}}^1\times {\mathrm{227}}^1\times {\mathrm{397}}^1$

素因数の和:709

約数の個数: 72

約数和(自身を含む): 1417784256

約数和(自身を除く): 777939356

約数列:

[1, 2, 4, 5, 10, 20, 25, 50, 71, 100, 142, 227, 284, 355, 397, 454, 710, 794, 908, 1135, 1420, 1588, 1775, 1985, 2270, 3550, 3970, 4540, 5675, 7100, 7940, 9925, 11350, 16117, 19850, 22700, 28187, 32234, 39700, 56374, 64468, 80585, 90119, 112748, 140935, 161170, 180238, 281870, 322340, 360476, 402925, 450595, 563740, 704675, 805850, 901190, 1409350, 1611700, 1802380, 2252975, 2818700, 4505950, 6398449, 9011900, 12796898, 25593796, 31992245, 63984490, 127968980, 159961225, 319922450, 639844900]

約数ペア:

[(1, 639844900), (2, 319922450), (4, 159961225), (5, 127968980), (10, 63984490), (20, 31992245), (25, 25593796), (50, 12796898), (71, 9011900), (100, 6398449), (142, 4505950), (227, 2818700), (284, 2252975), (355, 1802380), (397, 1611700), (454, 1409350), (710, 901190), (794, 805850), (908, 704675), (1135, 563740), (1420, 450595), (1588, 402925), (1775, 360476), (1985, 322340), (2270, 281870), (3550, 180238), (3970, 161170), (4540, 140935), (5675, 112748), (7100, 90119), (7940, 80585), (9925, 64468), (11350, 56374), (16117, 39700), (19850, 32234), (22700, 28187)]