18939890

素因数分解:

$2^1\times 5^1\times {\mathrm{61}}^2\times {\mathrm{509}}^1$

素因数の和:638

約数の個数: 24

約数和(自身を含む): 34727940

約数和(自身を除く): 15788050

約数列:

[1, 2, 5, 10, 61, 122, 305, 509, 610, 1018, 2545, 3721, 5090, 7442, 18605, 31049, 37210, 62098, 155245, 310490, 1893989, 3787978, 9469945, 18939890]

約数ペア:

[(1, 18939890), (2, 9469945), (5, 3787978), (10, 1893989), (61, 310490), (122, 155245), (305, 62098), (509, 37210), (610, 31049), (1018, 18605), (2545, 7442), (3721, 5090)]