400255400

素因数分解:

$2^3\times 5^2\times {\mathrm{71}}^2\times {\mathrm{397}}^1$

素因数の和:555

約数の個数: 72

約数和(自身を含む): 946262910

約数和(自身を除く): 546007510

約数列:

[1, 2, 4, 5, 8, 10, 20, 25, 40, 50, 71, 100, 142, 200, 284, 355, 397, 568, 710, 794, 1420, 1588, 1775, 1985, 2840, 3176, 3550, 3970, 5041, 7100, 7940, 9925, 10082, 14200, 15880, 19850, 20164, 25205, 28187, 39700, 40328, 50410, 56374, 79400, 100820, 112748, 126025, 140935, 201640, 225496, 252050, 281870, 504100, 563740, 704675, 1008200, 1127480, 1409350, 2001277, 2818700, 4002554, 5637400, 8005108, 10006385, 16010216, 20012770, 40025540, 50031925, 80051080, 100063850, 200127700, 400255400]

約数ペア:

[(1, 400255400), (2, 200127700), (4, 100063850), (5, 80051080), (8, 50031925), (10, 40025540), (20, 20012770), (25, 16010216), (40, 10006385), (50, 8005108), (71, 5637400), (100, 4002554), (142, 2818700), (200, 2001277), (284, 1409350), (355, 1127480), (397, 1008200), (568, 704675), (710, 563740), (794, 504100), (1420, 281870), (1588, 252050), (1775, 225496), (1985, 201640), (2840, 140935), (3176, 126025), (3550, 112748), (3970, 100820), (5041, 79400), (7100, 56374), (7940, 50410), (9925, 40328), (10082, 39700), (14200, 28187), (15880, 25205), (19850, 20164)]