21423520

素因数分解:

$2^5\times 5^1\times {\mathrm{257}}^1\times {\mathrm{521}}^1$

素因数の和:793

約数の個数: 48

約数和(自身を含む): 50907528

約数和(自身を除く): 29484008

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 80, 160, 257, 514, 521, 1028, 1042, 1285, 2056, 2084, 2570, 2605, 4112, 4168, 5140, 5210, 8224, 8336, 10280, 10420, 16672, 20560, 20840, 41120, 41680, 83360, 133897, 267794, 535588, 669485, 1071176, 1338970, 2142352, 2677940, 4284704, 5355880, 10711760, 21423520]

約数ペア:

[(1, 21423520), (2, 10711760), (4, 5355880), (5, 4284704), (8, 2677940), (10, 2142352), (16, 1338970), (20, 1071176), (32, 669485), (40, 535588), (80, 267794), (160, 133897), (257, 83360), (514, 41680), (521, 41120), (1028, 20840), (1042, 20560), (1285, 16672), (2056, 10420), (2084, 10280), (2570, 8336), (2605, 8224), (4112, 5210), (4168, 5140)]