19978145

素因数分解:

$5^1\times {\mathrm{11}}^1\times {\mathrm{17}}^1\times {\mathrm{23}}^1\times {\mathrm{929}}^1$

素因数の和:985

約数の個数: 32

約数和(自身を含む): 28926720

約数和(自身を除く): 8948575

約数列:

[1, 5, 11, 17, 23, 55, 85, 115, 187, 253, 391, 929, 935, 1265, 1955, 4301, 4645, 10219, 15793, 21367, 21505, 51095, 78965, 106835, 173723, 235037, 363239, 868615, 1175185, 1816195, 3995629, 19978145]

約数ペア:

[(1, 19978145), (5, 3995629), (11, 1816195), (17, 1175185), (23, 868615), (55, 363239), (85, 235037), (115, 173723), (187, 106835), (253, 78965), (391, 51095), (929, 21505), (935, 21367), (1265, 15793), (1955, 10219), (4301, 4645)]