19980740

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^1\times {\mathrm{31}}^1\times {\mathrm{37}}^1\times {\mathrm{67}}^1$

素因数の和:157

約数の個数: 96

約数和(自身を含む): 48620544

約数和(自身を除く): 28639804

約数列:

[1, 2, 4, 5, 10, 13, 20, 26, 31, 37, 52, 62, 65, 67, 74, 124, 130, 134, 148, 155, 185, 260, 268, 310, 335, 370, 403, 481, 620, 670, 740, 806, 871, 962, 1147, 1340, 1612, 1742, 1924, 2015, 2077, 2294, 2405, 2479, 3484, 4030, 4154, 4355, 4588, 4810, 4958, 5735, 8060, 8308, 8710, 9620, 9916, 10385, 11470, 12395, 14911, 17420, 20770, 22940, 24790, 27001, 29822, 32227, 41540, 49580, 54002, 59644, 64454, 74555, 76849, 108004, 128908, 135005, 149110, 153698, 161135, 270010, 298220, 307396, 322270, 384245, 540020, 644540, 768490, 999037, 1536980, 1998074, 3996148, 4995185, 9990370, 19980740]

約数ペア:

[(1, 19980740), (2, 9990370), (4, 4995185), (5, 3996148), (10, 1998074), (13, 1536980), (20, 999037), (26, 768490), (31, 644540), (37, 540020), (52, 384245), (62, 322270), (65, 307396), (67, 298220), (74, 270010), (124, 161135), (130, 153698), (134, 149110), (148, 135005), (155, 128908), (185, 108004), (260, 76849), (268, 74555), (310, 64454), (335, 59644), (370, 54002), (403, 49580), (481, 41540), (620, 32227), (670, 29822), (740, 27001), (806, 24790), (871, 22940), (962, 20770), (1147, 17420), (1340, 14911), (1612, 12395), (1742, 11470), (1924, 10385), (2015, 9916), (2077, 9620), (2294, 8710), (2405, 8308), (2479, 8060), (3484, 5735), (4030, 4958), (4154, 4810), (4355, 4588)]