20388640

素因数分解:

$2^5\times 5^1\times {\mathrm{61}}^1\times {\mathrm{2089}}^1$

素因数の和:2165

約数の個数: 48

約数和(自身を含む): 48981240

約数和(自身を除く): 28592600

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 61, 80, 122, 160, 244, 305, 488, 610, 976, 1220, 1952, 2089, 2440, 4178, 4880, 8356, 9760, 10445, 16712, 20890, 33424, 41780, 66848, 83560, 127429, 167120, 254858, 334240, 509716, 637145, 1019432, 1274290, 2038864, 2548580, 4077728, 5097160, 10194320, 20388640]

約数ペア:

[(1, 20388640), (2, 10194320), (4, 5097160), (5, 4077728), (8, 2548580), (10, 2038864), (16, 1274290), (20, 1019432), (32, 637145), (40, 509716), (61, 334240), (80, 254858), (122, 167120), (160, 127429), (244, 83560), (305, 66848), (488, 41780), (610, 33424), (976, 20890), (1220, 16712), (1952, 10445), (2089, 9760), (2440, 8356), (4178, 4880)]