19857680

素因数分解:

$2^4\times 5^1\times {\mathrm{89}}^1\times {\mathrm{2789}}^1$

素因数の和:2891

約数の個数: 40

約数和(自身を含む): 46704600

約数和(自身を除く): 26846920

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 89, 178, 356, 445, 712, 890, 1424, 1780, 2789, 3560, 5578, 7120, 11156, 13945, 22312, 27890, 44624, 55780, 111560, 223120, 248221, 496442, 992884, 1241105, 1985768, 2482210, 3971536, 4964420, 9928840, 19857680]

約数ペア:

[(1, 19857680), (2, 9928840), (4, 4964420), (5, 3971536), (8, 2482210), (10, 1985768), (16, 1241105), (20, 992884), (40, 496442), (80, 248221), (89, 223120), (178, 111560), (356, 55780), (445, 44624), (712, 27890), (890, 22312), (1424, 13945), (1780, 11156), (2789, 7120), (3560, 5578)]