20381440

素因数分解:

$2^8\times 5^1\times {\mathrm{15923}}^1$

素因数の和:15944

約数の個数: 36

約数和(自身を含む): 48822984

約数和(自身を除く): 28441544

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 80, 128, 160, 256, 320, 640, 1280, 15923, 31846, 63692, 79615, 127384, 159230, 254768, 318460, 509536, 636920, 1019072, 1273840, 2038144, 2547680, 4076288, 5095360, 10190720, 20381440]

約数ペア:

[(1, 20381440), (2, 10190720), (4, 5095360), (5, 4076288), (8, 2547680), (10, 2038144), (16, 1273840), (20, 1019072), (32, 636920), (40, 509536), (64, 318460), (80, 254768), (128, 159230), (160, 127384), (256, 79615), (320, 63692), (640, 31846), (1280, 15923)]