20657315

素因数分解:

$5^1\times 7^1\times {\mathrm{31}}^1\times {\mathrm{79}}^1\times {\mathrm{241}}^1$

素因数の和:363

約数の個数: 32

約数和(自身を含む): 29736960

約数和(自身を除く): 9079645

約数列:

[1, 5, 7, 31, 35, 79, 155, 217, 241, 395, 553, 1085, 1205, 1687, 2449, 2765, 7471, 8435, 12245, 17143, 19039, 37355, 52297, 85715, 95195, 133273, 261485, 590209, 666365, 2951045, 4131463, 20657315]

約数ペア:

[(1, 20657315), (5, 4131463), (7, 2951045), (31, 666365), (35, 590209), (79, 261485), (155, 133273), (217, 95195), (241, 85715), (395, 52297), (553, 37355), (1085, 19039), (1205, 17143), (1687, 12245), (2449, 8435), (2765, 7471)]