20489840

素因数分解:

$2^4\times 5^1\times 7^2\times {\mathrm{5227}}^1$

素因数の和:5254

約数の個数: 60

約数和(自身を含む): 55427256

約数和(自身を除く): 34937416

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 16, 20, 28, 35, 40, 49, 56, 70, 80, 98, 112, 140, 196, 245, 280, 392, 490, 560, 784, 980, 1960, 3920, 5227, 10454, 20908, 26135, 36589, 41816, 52270, 73178, 83632, 104540, 146356, 182945, 209080, 256123, 292712, 365890, 418160, 512246, 585424, 731780, 1024492, 1280615, 1463560, 2048984, 2561230, 2927120, 4097968, 5122460, 10244920, 20489840]

約数ペア:

[(1, 20489840), (2, 10244920), (4, 5122460), (5, 4097968), (7, 2927120), (8, 2561230), (10, 2048984), (14, 1463560), (16, 1280615), (20, 1024492), (28, 731780), (35, 585424), (40, 512246), (49, 418160), (56, 365890), (70, 292712), (80, 256123), (98, 209080), (112, 182945), (140, 146356), (196, 104540), (245, 83632), (280, 73178), (392, 52270), (490, 41816), (560, 36589), (784, 26135), (980, 20908), (1960, 10454), (3920, 5227)]