17981980

素因数分解:

$2^2\times 5^1\times {\mathrm{19}}^1\times {\mathrm{79}}^1\times {\mathrm{599}}^1$

素因数の和:706

約数の個数: 48

約数和(自身を含む): 40320000

約数和(自身を除く): 22338020

約数列:

[1, 2, 4, 5, 10, 19, 20, 38, 76, 79, 95, 158, 190, 316, 380, 395, 599, 790, 1198, 1501, 1580, 2396, 2995, 3002, 5990, 6004, 7505, 11381, 11980, 15010, 22762, 30020, 45524, 47321, 56905, 94642, 113810, 189284, 227620, 236605, 473210, 899099, 946420, 1798198, 3596396, 4495495, 8990990, 17981980]

約数ペア:

[(1, 17981980), (2, 8990990), (4, 4495495), (5, 3596396), (10, 1798198), (19, 946420), (20, 899099), (38, 473210), (76, 236605), (79, 227620), (95, 189284), (158, 113810), (190, 94642), (316, 56905), (380, 47321), (395, 45524), (599, 30020), (790, 22762), (1198, 15010), (1501, 11980), (1580, 11381), (2396, 7505), (2995, 6004), (3002, 5990)]