18016780

素因数分解:

$2^2\times 5^1\times {\mathrm{37}}^1\times {\mathrm{97}}^1\times {\mathrm{251}}^1$

素因数の和:394

約数の個数: 48

約数和(自身を含む): 39414816

約数和(自身を除く): 21398036

約数列:

[1, 2, 4, 5, 10, 20, 37, 74, 97, 148, 185, 194, 251, 370, 388, 485, 502, 740, 970, 1004, 1255, 1940, 2510, 3589, 5020, 7178, 9287, 14356, 17945, 18574, 24347, 35890, 37148, 46435, 48694, 71780, 92870, 97388, 121735, 185740, 243470, 486940, 900839, 1801678, 3603356, 4504195, 9008390, 18016780]

約数ペア:

[(1, 18016780), (2, 9008390), (4, 4504195), (5, 3603356), (10, 1801678), (20, 900839), (37, 486940), (74, 243470), (97, 185740), (148, 121735), (185, 97388), (194, 92870), (251, 71780), (370, 48694), (388, 46435), (485, 37148), (502, 35890), (740, 24347), (970, 18574), (1004, 17945), (1255, 14356), (1940, 9287), (2510, 7178), (3589, 5020)]