21731372

素因数分解:

$2^2\times {\mathrm{13}}^2\times {\mathrm{17}}^1\times {\mathrm{31}}^1\times {\mathrm{61}}^1$

素因数の和:139

約数の個数: 72

約数和(自身を含む): 45747072

約数和(自身を除く): 24015700

約数列:

[1, 2, 4, 13, 17, 26, 31, 34, 52, 61, 62, 68, 122, 124, 169, 221, 244, 338, 403, 442, 527, 676, 793, 806, 884, 1037, 1054, 1586, 1612, 1891, 2074, 2108, 2873, 3172, 3782, 4148, 5239, 5746, 6851, 7564, 10309, 10478, 11492, 13481, 13702, 20618, 20956, 24583, 26962, 27404, 32147, 41236, 49166, 53924, 64294, 89063, 98332, 128588, 175253, 178126, 319579, 350506, 356252, 417911, 639158, 701012, 835822, 1278316, 1671644, 5432843, 10865686, 21731372]

約数ペア:

[(1, 21731372), (2, 10865686), (4, 5432843), (13, 1671644), (17, 1278316), (26, 835822), (31, 701012), (34, 639158), (52, 417911), (61, 356252), (62, 350506), (68, 319579), (122, 178126), (124, 175253), (169, 128588), (221, 98332), (244, 89063), (338, 64294), (403, 53924), (442, 49166), (527, 41236), (676, 32147), (793, 27404), (806, 26962), (884, 24583), (1037, 20956), (1054, 20618), (1586, 13702), (1612, 13481), (1891, 11492), (2074, 10478), (2108, 10309), (2873, 7564), (3172, 6851), (3782, 5746), (4148, 5239)]