19811990

素因数分解:

$2^1\times 5^1\times {\mathrm{11}}^1\times {\mathrm{233}}^1\times {\mathrm{773}}^1$

素因数の和:1024

約数の個数: 32

約数和(自身を含む): 39121056

約数和(自身を除く): 19309066

約数列:

[1, 2, 5, 10, 11, 22, 55, 110, 233, 466, 773, 1165, 1546, 2330, 2563, 3865, 5126, 7730, 8503, 12815, 17006, 25630, 42515, 85030, 180109, 360218, 900545, 1801090, 1981199, 3962398, 9905995, 19811990]

約数ペア:

[(1, 19811990), (2, 9905995), (5, 3962398), (10, 1981199), (11, 1801090), (22, 900545), (55, 360218), (110, 180109), (233, 85030), (466, 42515), (773, 25630), (1165, 17006), (1546, 12815), (2330, 8503), (2563, 7730), (3865, 5126)]