21147915

素因数分解:

$3^1\times 5^1\times {\mathrm{17}}^1\times {\mathrm{239}}^1\times {\mathrm{347}}^1$

素因数の和:611

約数の個数: 32

約数和(自身を含む): 36080640

約数和(自身を除く): 14932725

約数列:

[1, 3, 5, 15, 17, 51, 85, 239, 255, 347, 717, 1041, 1195, 1735, 3585, 4063, 5205, 5899, 12189, 17697, 20315, 29495, 60945, 82933, 88485, 248799, 414665, 1243995, 1409861, 4229583, 7049305, 21147915]

約数ペア:

[(1, 21147915), (3, 7049305), (5, 4229583), (15, 1409861), (17, 1243995), (51, 414665), (85, 248799), (239, 88485), (255, 82933), (347, 60945), (717, 29495), (1041, 20315), (1195, 17697), (1735, 12189), (3585, 5899), (4063, 5205)]