21405571

素因数分解:

${\mathrm{11}}^1\times {\mathrm{19}}^1\times {\mathrm{23}}^1\times {\mathrm{61}}^1\times {\mathrm{73}}^1$

素因数の和:187

約数の個数: 32

約数和(自身を含む): 26426880

約数和(自身を除く): 5021309

約数列:

[1, 11, 19, 23, 61, 73, 209, 253, 437, 671, 803, 1159, 1387, 1403, 1679, 4453, 4807, 12749, 15257, 15433, 18469, 26657, 31901, 48983, 84607, 102419, 293227, 350911, 930677, 1126609, 1945961, 21405571]

約数ペア:

[(1, 21405571), (11, 1945961), (19, 1126609), (23, 930677), (61, 350911), (73, 293227), (209, 102419), (253, 84607), (437, 48983), (671, 31901), (803, 26657), (1159, 18469), (1387, 15433), (1403, 15257), (1679, 12749), (4453, 4807)]