20889880

素因数分解:

$2^3\times 5^1\times {\mathrm{11}}^1\times {\mathrm{197}}^1\times {\mathrm{241}}^1$

素因数の和:460

約数の個数: 64

約数和(自身を含む): 51749280

約数和(自身を除く): 30859400

約数列:

[1, 2, 4, 5, 8, 10, 11, 20, 22, 40, 44, 55, 88, 110, 197, 220, 241, 394, 440, 482, 788, 964, 985, 1205, 1576, 1928, 1970, 2167, 2410, 2651, 3940, 4334, 4820, 5302, 7880, 8668, 9640, 10604, 10835, 13255, 17336, 21208, 21670, 26510, 43340, 47477, 53020, 86680, 94954, 106040, 189908, 237385, 379816, 474770, 522247, 949540, 1044494, 1899080, 2088988, 2611235, 4177976, 5222470, 10444940, 20889880]

約数ペア:

[(1, 20889880), (2, 10444940), (4, 5222470), (5, 4177976), (8, 2611235), (10, 2088988), (11, 1899080), (20, 1044494), (22, 949540), (40, 522247), (44, 474770), (55, 379816), (88, 237385), (110, 189908), (197, 106040), (220, 94954), (241, 86680), (394, 53020), (440, 47477), (482, 43340), (788, 26510), (964, 21670), (985, 21208), (1205, 17336), (1576, 13255), (1928, 10835), (1970, 10604), (2167, 9640), (2410, 8668), (2651, 7880), (3940, 5302), (4334, 4820)]