21019820

素因数分解:

$2^2\times 5^1\times {\mathrm{17}}^1\times {\mathrm{211}}^1\times {\mathrm{293}}^1$

素因数の和:530

約数の個数: 48

約数和(自身を含む): 47119968

約数和(自身を除く): 26100148

約数列:

[1, 2, 4, 5, 10, 17, 20, 34, 68, 85, 170, 211, 293, 340, 422, 586, 844, 1055, 1172, 1465, 2110, 2930, 3587, 4220, 4981, 5860, 7174, 9962, 14348, 17935, 19924, 24905, 35870, 49810, 61823, 71740, 99620, 123646, 247292, 309115, 618230, 1050991, 1236460, 2101982, 4203964, 5254955, 10509910, 21019820]

約数ペア:

[(1, 21019820), (2, 10509910), (4, 5254955), (5, 4203964), (10, 2101982), (17, 1236460), (20, 1050991), (34, 618230), (68, 309115), (85, 247292), (170, 123646), (211, 99620), (293, 71740), (340, 61823), (422, 49810), (586, 35870), (844, 24905), (1055, 19924), (1172, 17935), (1465, 14348), (2110, 9962), (2930, 7174), (3587, 5860), (4220, 4981)]