18679420

素因数分解:

$2^2\times 5^1\times {\mathrm{61}}^2\times {\mathrm{251}}^1$

素因数の和:382

約数の個数: 36

約数和(自身を含む): 40039272

約数和(自身を除く): 21359852

約数列:

[1, 2, 4, 5, 10, 20, 61, 122, 244, 251, 305, 502, 610, 1004, 1220, 1255, 2510, 3721, 5020, 7442, 14884, 15311, 18605, 30622, 37210, 61244, 74420, 76555, 153110, 306220, 933971, 1867942, 3735884, 4669855, 9339710, 18679420]

約数ペア:

[(1, 18679420), (2, 9339710), (4, 4669855), (5, 3735884), (10, 1867942), (20, 933971), (61, 306220), (122, 153110), (244, 76555), (251, 74420), (305, 61244), (502, 37210), (610, 30622), (1004, 18605), (1220, 15311), (1255, 14884), (2510, 7442), (3721, 5020)]