19911580

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^2\times {\mathrm{43}}^1\times {\mathrm{137}}^1$

素因数の和:215

約数の個数: 72

約数和(自身を含む): 46669392

約数和(自身を除く): 26757812

約数列:

[1, 2, 4, 5, 10, 13, 20, 26, 43, 52, 65, 86, 130, 137, 169, 172, 215, 260, 274, 338, 430, 548, 559, 676, 685, 845, 860, 1118, 1370, 1690, 1781, 2236, 2740, 2795, 3380, 3562, 5590, 5891, 7124, 7267, 8905, 11180, 11782, 14534, 17810, 23153, 23564, 29068, 29455, 35620, 36335, 46306, 58910, 72670, 76583, 92612, 115765, 117820, 145340, 153166, 231530, 306332, 382915, 463060, 765830, 995579, 1531660, 1991158, 3982316, 4977895, 9955790, 19911580]

約数ペア:

[(1, 19911580), (2, 9955790), (4, 4977895), (5, 3982316), (10, 1991158), (13, 1531660), (20, 995579), (26, 765830), (43, 463060), (52, 382915), (65, 306332), (86, 231530), (130, 153166), (137, 145340), (169, 117820), (172, 115765), (215, 92612), (260, 76583), (274, 72670), (338, 58910), (430, 46306), (548, 36335), (559, 35620), (676, 29455), (685, 29068), (845, 23564), (860, 23153), (1118, 17810), (1370, 14534), (1690, 11782), (1781, 11180), (2236, 8905), (2740, 7267), (2795, 7124), (3380, 5891), (3562, 5590)]