20101718

素因数分解:

$2^1\times 7^1\times {\mathrm{13}}^1\times {\mathrm{17}}^1\times {\mathrm{73}}^1\times {\mathrm{89}}^1$

素因数の和:201

約数の個数: 64

約数和(自身を含む): 40279680

約数和(自身を除く): 20177962

約数列:

[1, 2, 7, 13, 14, 17, 26, 34, 73, 89, 91, 119, 146, 178, 182, 221, 238, 442, 511, 623, 949, 1022, 1157, 1241, 1246, 1513, 1547, 1898, 2314, 2482, 3026, 3094, 6497, 6643, 8099, 8687, 10591, 12994, 13286, 16133, 16198, 17374, 19669, 21182, 32266, 39338, 45479, 84461, 90958, 110449, 112931, 137683, 168922, 220898, 225862, 275366, 591227, 773143, 1182454, 1435837, 1546286, 2871674, 10050859, 20101718]

約数ペア:

[(1, 20101718), (2, 10050859), (7, 2871674), (13, 1546286), (14, 1435837), (17, 1182454), (26, 773143), (34, 591227), (73, 275366), (89, 225862), (91, 220898), (119, 168922), (146, 137683), (178, 112931), (182, 110449), (221, 90958), (238, 84461), (442, 45479), (511, 39338), (623, 32266), (949, 21182), (1022, 19669), (1157, 17374), (1241, 16198), (1246, 16133), (1513, 13286), (1547, 12994), (1898, 10591), (2314, 8687), (2482, 8099), (3026, 6643), (3094, 6497)]