21048400

素因数分解:

$2^4\times 5^2\times {\mathrm{101}}^1\times {\mathrm{521}}^1$

素因数の和:640

約数の個数: 60

約数和(自身を含む): 51167484

約数和(自身を除く): 30119084

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 25, 40, 50, 80, 100, 101, 200, 202, 400, 404, 505, 521, 808, 1010, 1042, 1616, 2020, 2084, 2525, 2605, 4040, 4168, 5050, 5210, 8080, 8336, 10100, 10420, 13025, 20200, 20840, 26050, 40400, 41680, 52100, 52621, 104200, 105242, 208400, 210484, 263105, 420968, 526210, 841936, 1052420, 1315525, 2104840, 2631050, 4209680, 5262100, 10524200, 21048400]

約数ペア:

[(1, 21048400), (2, 10524200), (4, 5262100), (5, 4209680), (8, 2631050), (10, 2104840), (16, 1315525), (20, 1052420), (25, 841936), (40, 526210), (50, 420968), (80, 263105), (100, 210484), (101, 208400), (200, 105242), (202, 104200), (400, 52621), (404, 52100), (505, 41680), (521, 40400), (808, 26050), (1010, 20840), (1042, 20200), (1616, 13025), (2020, 10420), (2084, 10100), (2525, 8336), (2605, 8080), (4040, 5210), (4168, 5050)]