12721880

素因数分解:

$2^3\times 5^1\times {\mathrm{557}}^1\times {\mathrm{571}}^1$

素因数の和:1139

約数の個数: 32

約数和(自身を含む): 28725840

約数和(自身を除く): 16003960

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 557, 571, 1114, 1142, 2228, 2284, 2785, 2855, 4456, 4568, 5570, 5710, 11140, 11420, 22280, 22840, 318047, 636094, 1272188, 1590235, 2544376, 3180470, 6360940, 12721880]

約数ペア:

[(1, 12721880), (2, 6360940), (4, 3180470), (5, 2544376), (8, 1590235), (10, 1272188), (20, 636094), (40, 318047), (557, 22840), (571, 22280), (1114, 11420), (1142, 11140), (2228, 5710), (2284, 5570), (2785, 4568), (2855, 4456)]