21811180

素因数分解:

$2^2\times 5^1\times {\mathrm{41}}^1\times {\mathrm{67}}^1\times {\mathrm{397}}^1$

素因数の和:514

約数の個数: 48

約数和(自身を含む): 47740896

約数和(自身を除く): 25929716

約数列:

[1, 2, 4, 5, 10, 20, 41, 67, 82, 134, 164, 205, 268, 335, 397, 410, 670, 794, 820, 1340, 1588, 1985, 2747, 3970, 5494, 7940, 10988, 13735, 16277, 26599, 27470, 32554, 53198, 54940, 65108, 81385, 106396, 132995, 162770, 265990, 325540, 531980, 1090559, 2181118, 4362236, 5452795, 10905590, 21811180]

約数ペア:

[(1, 21811180), (2, 10905590), (4, 5452795), (5, 4362236), (10, 2181118), (20, 1090559), (41, 531980), (67, 325540), (82, 265990), (134, 162770), (164, 132995), (205, 106396), (268, 81385), (335, 65108), (397, 54940), (410, 53198), (670, 32554), (794, 27470), (820, 26599), (1340, 16277), (1588, 13735), (1985, 10988), (2747, 7940), (3970, 5494)]