81221120

素因数分解:

$2^9\times 5^1\times {\mathrm{31727}}^1$

素因数の和:31750

約数の個数: 40

約数和(自身を含む): 194746464

約数和(自身を除く): 113525344

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 80, 128, 160, 256, 320, 512, 640, 1280, 2560, 31727, 63454, 126908, 158635, 253816, 317270, 507632, 634540, 1015264, 1269080, 2030528, 2538160, 4061056, 5076320, 8122112, 10152640, 16244224, 20305280, 40610560, 81221120]

約数ペア:

[(1, 81221120), (2, 40610560), (4, 20305280), (5, 16244224), (8, 10152640), (10, 8122112), (16, 5076320), (20, 4061056), (32, 2538160), (40, 2030528), (64, 1269080), (80, 1015264), (128, 634540), (160, 507632), (256, 317270), (320, 253816), (512, 158635), (640, 126908), (1280, 63454), (2560, 31727)]