21220556

素因数分解:

$2^2\times 7^1\times {\mathrm{17}}^1\times {\mathrm{109}}^1\times {\mathrm{409}}^1$

素因数の和:546

約数の個数: 48

約数和(自身を含む): 45460800

約数和(自身を除く): 24240244

約数列:

[1, 2, 4, 7, 14, 17, 28, 34, 68, 109, 119, 218, 238, 409, 436, 476, 763, 818, 1526, 1636, 1853, 2863, 3052, 3706, 5726, 6953, 7412, 11452, 12971, 13906, 25942, 27812, 44581, 48671, 51884, 89162, 97342, 178324, 194684, 312067, 624134, 757877, 1248268, 1515754, 3031508, 5305139, 10610278, 21220556]

約数ペア:

[(1, 21220556), (2, 10610278), (4, 5305139), (7, 3031508), (14, 1515754), (17, 1248268), (28, 757877), (34, 624134), (68, 312067), (109, 194684), (119, 178324), (218, 97342), (238, 89162), (409, 51884), (436, 48671), (476, 44581), (763, 27812), (818, 25942), (1526, 13906), (1636, 12971), (1853, 11452), (2863, 7412), (3052, 6953), (3706, 5726)]