20453680

素因数分解:

$2^4\times 5^1\times {\mathrm{13}}^1\times {\mathrm{71}}^1\times {\mathrm{277}}^1$

素因数の和:374

約数の個数: 80

約数和(自身を含む): 52121664

約数和(自身を除く): 31667984

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 20, 26, 40, 52, 65, 71, 80, 104, 130, 142, 208, 260, 277, 284, 355, 520, 554, 568, 710, 923, 1040, 1108, 1136, 1385, 1420, 1846, 2216, 2770, 2840, 3601, 3692, 4432, 4615, 5540, 5680, 7202, 7384, 9230, 11080, 14404, 14768, 18005, 18460, 19667, 22160, 28808, 36010, 36920, 39334, 57616, 72020, 73840, 78668, 98335, 144040, 157336, 196670, 255671, 288080, 314672, 393340, 511342, 786680, 1022684, 1278355, 1573360, 2045368, 2556710, 4090736, 5113420, 10226840, 20453680]

約数ペア:

[(1, 20453680), (2, 10226840), (4, 5113420), (5, 4090736), (8, 2556710), (10, 2045368), (13, 1573360), (16, 1278355), (20, 1022684), (26, 786680), (40, 511342), (52, 393340), (65, 314672), (71, 288080), (80, 255671), (104, 196670), (130, 157336), (142, 144040), (208, 98335), (260, 78668), (277, 73840), (284, 72020), (355, 57616), (520, 39334), (554, 36920), (568, 36010), (710, 28808), (923, 22160), (1040, 19667), (1108, 18460), (1136, 18005), (1385, 14768), (1420, 14404), (1846, 11080), (2216, 9230), (2770, 7384), (2840, 7202), (3601, 5680), (3692, 5540), (4432, 4615)]