21080540

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^1\times {\mathrm{89}}^1\times {\mathrm{911}}^1$

素因数の和:1022

約数の個数: 48

約数和(自身を含む): 48263040

約数和(自身を除く): 27182500

約数列:

[1, 2, 4, 5, 10, 13, 20, 26, 52, 65, 89, 130, 178, 260, 356, 445, 890, 911, 1157, 1780, 1822, 2314, 3644, 4555, 4628, 5785, 9110, 11570, 11843, 18220, 23140, 23686, 47372, 59215, 81079, 118430, 162158, 236860, 324316, 405395, 810790, 1054027, 1621580, 2108054, 4216108, 5270135, 10540270, 21080540]

約数ペア:

[(1, 21080540), (2, 10540270), (4, 5270135), (5, 4216108), (10, 2108054), (13, 1621580), (20, 1054027), (26, 810790), (52, 405395), (65, 324316), (89, 236860), (130, 162158), (178, 118430), (260, 81079), (356, 59215), (445, 47372), (890, 23686), (911, 23140), (1157, 18220), (1780, 11843), (1822, 11570), (2314, 9110), (3644, 5785), (4555, 4628)]