17781988

素因数分解:

$2^2\times 7^1\times {\mathrm{29}}^1\times {\mathrm{61}}^1\times {\mathrm{359}}^1$

素因数の和:460

約数の個数: 48

約数和(自身を含む): 37497600

約数和(自身を除く): 19715612

約数列:

[1, 2, 4, 7, 14, 28, 29, 58, 61, 116, 122, 203, 244, 359, 406, 427, 718, 812, 854, 1436, 1708, 1769, 2513, 3538, 5026, 7076, 10052, 10411, 12383, 20822, 21899, 24766, 41644, 43798, 49532, 72877, 87596, 145754, 153293, 291508, 306586, 613172, 635071, 1270142, 2540284, 4445497, 8890994, 17781988]

約数ペア:

[(1, 17781988), (2, 8890994), (4, 4445497), (7, 2540284), (14, 1270142), (28, 635071), (29, 613172), (58, 306586), (61, 291508), (116, 153293), (122, 145754), (203, 87596), (244, 72877), (359, 49532), (406, 43798), (427, 41644), (718, 24766), (812, 21899), (854, 20822), (1436, 12383), (1708, 10411), (1769, 10052), (2513, 7076), (3538, 5026)]