21721810

素因数分解:

$2^1\times 5^1\times {\mathrm{11}}^1\times {\mathrm{181}}^1\times {\mathrm{1091}}^1$

素因数の和:1290

約数の個数: 32

約数和(自身を含む): 42928704

約数和(自身を除く): 21206894

約数列:

[1, 2, 5, 10, 11, 22, 55, 110, 181, 362, 905, 1091, 1810, 1991, 2182, 3982, 5455, 9955, 10910, 12001, 19910, 24002, 60005, 120010, 197471, 394942, 987355, 1974710, 2172181, 4344362, 10860905, 21721810]

約数ペア:

[(1, 21721810), (2, 10860905), (5, 4344362), (10, 2172181), (11, 1974710), (22, 987355), (55, 394942), (110, 197471), (181, 120010), (362, 60005), (905, 24002), (1091, 19910), (1810, 12001), (1991, 10910), (2182, 9955), (3982, 5455)]