81432640

素因数分解:

$2^6\times 5^1\times {\mathrm{397}}^1\times {\mathrm{641}}^1$

素因数の和:1055

約数の個数: 56

約数和(自身を含む): 194703192

約数和(自身を除く): 113270552

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 80, 160, 320, 397, 641, 794, 1282, 1588, 1985, 2564, 3176, 3205, 3970, 5128, 6352, 6410, 7940, 10256, 12704, 12820, 15880, 20512, 25408, 25640, 31760, 41024, 51280, 63520, 102560, 127040, 205120, 254477, 508954, 1017908, 1272385, 2035816, 2544770, 4071632, 5089540, 8143264, 10179080, 16286528, 20358160, 40716320, 81432640]

約数ペア:

[(1, 81432640), (2, 40716320), (4, 20358160), (5, 16286528), (8, 10179080), (10, 8143264), (16, 5089540), (20, 4071632), (32, 2544770), (40, 2035816), (64, 1272385), (80, 1017908), (160, 508954), (320, 254477), (397, 205120), (641, 127040), (794, 102560), (1282, 63520), (1588, 51280), (1985, 41024), (2564, 31760), (3176, 25640), (3205, 25408), (3970, 20512), (5128, 15880), (6352, 12820), (6410, 12704), (7940, 10256)]