18985640

素因数分解:

$2^3\times 5^1\times {\mathrm{31}}^1\times {\mathrm{61}}^1\times {\mathrm{251}}^1$

素因数の和:354

約数の個数: 64

約数和(自身を含む): 44997120

約数和(自身を除く): 26011480

約数列:

[1, 2, 4, 5, 8, 10, 20, 31, 40, 61, 62, 122, 124, 155, 244, 248, 251, 305, 310, 488, 502, 610, 620, 1004, 1220, 1240, 1255, 1891, 2008, 2440, 2510, 3782, 5020, 7564, 7781, 9455, 10040, 15128, 15311, 15562, 18910, 30622, 31124, 37820, 38905, 61244, 62248, 75640, 76555, 77810, 122488, 153110, 155620, 306220, 311240, 474641, 612440, 949282, 1898564, 2373205, 3797128, 4746410, 9492820, 18985640]

約数ペア:

[(1, 18985640), (2, 9492820), (4, 4746410), (5, 3797128), (8, 2373205), (10, 1898564), (20, 949282), (31, 612440), (40, 474641), (61, 311240), (62, 306220), (122, 155620), (124, 153110), (155, 122488), (244, 77810), (248, 76555), (251, 75640), (305, 62248), (310, 61244), (488, 38905), (502, 37820), (610, 31124), (620, 30622), (1004, 18910), (1220, 15562), (1240, 15311), (1255, 15128), (1891, 10040), (2008, 9455), (2440, 7781), (2510, 7564), (3782, 5020)]