81405560

素因数分解:

$2^3\times 5^1\times {\mathrm{109}}^1\times {\mathrm{18671}}^1$

素因数の和:18791

約数の個数: 32

約数和(自身を含む): 184852800

約数和(自身を除く): 103447240

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 109, 218, 436, 545, 872, 1090, 2180, 4360, 18671, 37342, 74684, 93355, 149368, 186710, 373420, 746840, 2035139, 4070278, 8140556, 10175695, 16281112, 20351390, 40702780, 81405560]

約数ペア:

[(1, 81405560), (2, 40702780), (4, 20351390), (5, 16281112), (8, 10175695), (10, 8140556), (20, 4070278), (40, 2035139), (109, 746840), (218, 373420), (436, 186710), (545, 149368), (872, 93355), (1090, 74684), (2180, 37342), (4360, 18671)]