20725647551

素因数分解:

$7^2\times {\mathrm{79}}^1\times {\mathrm{83}}^1\times {\mathrm{251}}^1\times {\mathrm{257}}^1$

素因数の和:684

約数の個数: 48

約数和(自身を含む): 24903728640

約数和(自身を除く): 4178081089

約数列:

[1, 7, 49, 79, 83, 251, 257, 553, 581, 1757, 1799, 3871, 4067, 6557, 12299, 12593, 19829, 20303, 20833, 21331, 45899, 64507, 138803, 142121, 145831, 149317, 321293, 451549, 971621, 994847, 1020817, 1045219, 1645807, 1685149, 3160843, 5096053, 5354081, 11520649, 11796043, 35672371, 37478567, 80644543, 82572301, 249706597, 262349969, 422972399, 2960806793, 20725647551]

約数ペア:

[(1, 20725647551), (7, 2960806793), (49, 422972399), (79, 262349969), (83, 249706597), (251, 82572301), (257, 80644543), (553, 37478567), (581, 35672371), (1757, 11796043), (1799, 11520649), (3871, 5354081), (4067, 5096053), (6557, 3160843), (12299, 1685149), (12593, 1645807), (19829, 1045219), (20303, 1020817), (20833, 994847), (21331, 971621), (45899, 451549), (64507, 321293), (138803, 149317), (142121, 145831)]