19901189

素因数分解:

$7^1\times {\mathrm{11}}^1\times {\mathrm{19}}^1\times {\mathrm{61}}^1\times {\mathrm{223}}^1$

素因数の和:321

約数の個数: 32

約数和(自身を含む): 26664960

約数和(自身を除く): 6763771

約数列:

[1, 7, 11, 19, 61, 77, 133, 209, 223, 427, 671, 1159, 1463, 1561, 2453, 4237, 4697, 8113, 12749, 13603, 17171, 29659, 46607, 89243, 95221, 149633, 258457, 326249, 1047431, 1809199, 2843027, 19901189]

約数ペア:

[(1, 19901189), (7, 2843027), (11, 1809199), (19, 1047431), (61, 326249), (77, 258457), (133, 149633), (209, 95221), (223, 89243), (427, 46607), (671, 29659), (1159, 17171), (1463, 13603), (1561, 12749), (2453, 8113), (4237, 4697)]