18651997

素因数分解:

$7^3\times {\mathrm{13}}^1\times {\mathrm{47}}^1\times {\mathrm{89}}^1$

素因数の和:170

約数の個数: 32

約数和(自身を含む): 24192000

約数和(自身を除く): 5540003

約数列:

[1, 7, 13, 47, 49, 89, 91, 329, 343, 611, 623, 637, 1157, 2303, 4183, 4277, 4361, 4459, 8099, 16121, 29281, 29939, 30527, 54379, 56693, 204967, 209573, 380653, 396851, 1434769, 2664571, 18651997]

約数ペア:

[(1, 18651997), (7, 2664571), (13, 1434769), (47, 396851), (49, 380653), (89, 209573), (91, 204967), (329, 56693), (343, 54379), (611, 30527), (623, 29939), (637, 29281), (1157, 16121), (2303, 8099), (4183, 4459), (4277, 4361)]