20405890

素因数分解:

$2^1\times 5^1\times {\mathrm{97}}^1\times {\mathrm{109}}^1\times {\mathrm{193}}^1$

素因数の和:406

約数の個数: 32

約数和(自身を含む): 37643760

約数和(自身を除く): 17237870

約数列:

[1, 2, 5, 10, 97, 109, 193, 194, 218, 386, 485, 545, 965, 970, 1090, 1930, 10573, 18721, 21037, 21146, 37442, 42074, 52865, 93605, 105185, 105730, 187210, 210370, 2040589, 4081178, 10202945, 20405890]

約数ペア:

[(1, 20405890), (2, 10202945), (5, 4081178), (10, 2040589), (97, 210370), (109, 187210), (193, 105730), (194, 105185), (218, 93605), (386, 52865), (485, 42074), (545, 37442), (965, 21146), (970, 21037), (1090, 18721), (1930, 10573)]