81815920

素因数分解:

$2^4\times 5^1\times {\mathrm{89}}^1\times {\mathrm{11491}}^1$

素因数の和:11593

約数の個数: 40

約数和(自身を含む): 192376080

約数和(自身を除く): 110560160

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 89, 178, 356, 445, 712, 890, 1424, 1780, 3560, 7120, 11491, 22982, 45964, 57455, 91928, 114910, 183856, 229820, 459640, 919280, 1022699, 2045398, 4090796, 5113495, 8181592, 10226990, 16363184, 20453980, 40907960, 81815920]

約数ペア:

[(1, 81815920), (2, 40907960), (4, 20453980), (5, 16363184), (8, 10226990), (10, 8181592), (16, 5113495), (20, 4090796), (40, 2045398), (80, 1022699), (89, 919280), (178, 459640), (356, 229820), (445, 183856), (712, 114910), (890, 91928), (1424, 57455), (1780, 45964), (3560, 22982), (7120, 11491)]