20787820

素因数分解:

$2^2\times 5^1\times {\mathrm{41}}^1\times {\mathrm{101}}^1\times {\mathrm{251}}^1$

素因数の和:402

約数の個数: 48

約数和(自身を含む): 45341856

約数和(自身を除く): 24554036

約数列:

[1, 2, 4, 5, 10, 20, 41, 82, 101, 164, 202, 205, 251, 404, 410, 502, 505, 820, 1004, 1010, 1255, 2020, 2510, 4141, 5020, 8282, 10291, 16564, 20582, 20705, 25351, 41164, 41410, 50702, 51455, 82820, 101404, 102910, 126755, 205820, 253510, 507020, 1039391, 2078782, 4157564, 5196955, 10393910, 20787820]

約数ペア:

[(1, 20787820), (2, 10393910), (4, 5196955), (5, 4157564), (10, 2078782), (20, 1039391), (41, 507020), (82, 253510), (101, 205820), (164, 126755), (202, 102910), (205, 101404), (251, 82820), (404, 51455), (410, 50702), (502, 41410), (505, 41164), (820, 25351), (1004, 20705), (1010, 20582), (1255, 16564), (2020, 10291), (2510, 8282), (4141, 5020)]