18978920

素因数分解:

$2^3\times 5^1\times {\mathrm{617}}^1\times {\mathrm{769}}^1$

素因数の和:1397

約数の個数: 32

約数和(自身を含む): 42827400

約数和(自身を除く): 23848480

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 617, 769, 1234, 1538, 2468, 3076, 3085, 3845, 4936, 6152, 6170, 7690, 12340, 15380, 24680, 30760, 474473, 948946, 1897892, 2372365, 3795784, 4744730, 9489460, 18978920]

約数ペア:

[(1, 18978920), (2, 9489460), (4, 4744730), (5, 3795784), (8, 2372365), (10, 1897892), (20, 948946), (40, 474473), (617, 30760), (769, 24680), (1234, 15380), (1538, 12340), (2468, 7690), (3076, 6170), (3085, 6152), (3845, 4936)]