21053395

素因数分解:

$5^1\times {\mathrm{11}}^2\times {\mathrm{17}}^1\times {\mathrm{23}}^1\times {\mathrm{89}}^1$

素因数の和:156

約数の個数: 48

約数和(自身を含む): 31026240

約数和(自身を除く): 9972845

約数列:

[1, 5, 11, 17, 23, 55, 85, 89, 115, 121, 187, 253, 391, 445, 605, 935, 979, 1265, 1513, 1955, 2047, 2057, 2783, 4301, 4895, 7565, 10235, 10285, 10769, 13915, 16643, 21505, 22517, 34799, 47311, 53845, 83215, 112585, 173995, 183073, 236555, 247687, 382789, 915365, 1238435, 1913945, 4210679, 21053395]

約数ペア:

[(1, 21053395), (5, 4210679), (11, 1913945), (17, 1238435), (23, 915365), (55, 382789), (85, 247687), (89, 236555), (115, 183073), (121, 173995), (187, 112585), (253, 83215), (391, 53845), (445, 47311), (605, 34799), (935, 22517), (979, 21505), (1265, 16643), (1513, 13915), (1955, 10769), (2047, 10285), (2057, 10235), (2783, 7565), (4301, 4895)]