31781620

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^1\times {\mathrm{251}}^1\times {\mathrm{487}}^1$

素因数の和:760

約数の個数: 48

約数和(自身を含む): 72309888

約数和(自身を除く): 40528268

約数列:

[1, 2, 4, 5, 10, 13, 20, 26, 52, 65, 130, 251, 260, 487, 502, 974, 1004, 1255, 1948, 2435, 2510, 3263, 4870, 5020, 6331, 6526, 9740, 12662, 13052, 16315, 25324, 31655, 32630, 63310, 65260, 122237, 126620, 244474, 488948, 611185, 1222370, 1589081, 2444740, 3178162, 6356324, 7945405, 15890810, 31781620]

約数ペア:

[(1, 31781620), (2, 15890810), (4, 7945405), (5, 6356324), (10, 3178162), (13, 2444740), (20, 1589081), (26, 1222370), (52, 611185), (65, 488948), (130, 244474), (251, 126620), (260, 122237), (487, 65260), (502, 63310), (974, 32630), (1004, 31655), (1255, 25324), (1948, 16315), (2435, 13052), (2510, 12662), (3263, 9740), (4870, 6526), (5020, 6331)]