21490317

素因数分解:

$3^2\times {\mathrm{67}}^1\times {\mathrm{157}}^1\times {\mathrm{227}}^1$

素因数の和:457

約数の個数: 24

約数和(自身を含む): 31845216

約数和(自身を除く): 10354899

約数列:

[1, 3, 9, 67, 157, 201, 227, 471, 603, 681, 1413, 2043, 10519, 15209, 31557, 35639, 45627, 94671, 106917, 136881, 320751, 2387813, 7163439, 21490317]

約数ペア:

[(1, 21490317), (3, 7163439), (9, 2387813), (67, 320751), (157, 136881), (201, 106917), (227, 94671), (471, 45627), (603, 35639), (681, 31557), (1413, 15209), (2043, 10519)]