21813880

素因数分解:

$2^3\times 5^1\times {\mathrm{11}}^2\times {\mathrm{4507}}^1$

素因数の和:4540

約数の個数: 48

約数和(自身を含む): 53960760

約数和(自身を除く): 32146880

約数列:

[1, 2, 4, 5, 8, 10, 11, 20, 22, 40, 44, 55, 88, 110, 121, 220, 242, 440, 484, 605, 968, 1210, 2420, 4507, 4840, 9014, 18028, 22535, 36056, 45070, 49577, 90140, 99154, 180280, 198308, 247885, 396616, 495770, 545347, 991540, 1090694, 1983080, 2181388, 2726735, 4362776, 5453470, 10906940, 21813880]

約数ペア:

[(1, 21813880), (2, 10906940), (4, 5453470), (5, 4362776), (8, 2726735), (10, 2181388), (11, 1983080), (20, 1090694), (22, 991540), (40, 545347), (44, 495770), (55, 396616), (88, 247885), (110, 198308), (121, 180280), (220, 99154), (242, 90140), (440, 49577), (484, 45070), (605, 36056), (968, 22535), (1210, 18028), (2420, 9014), (4507, 4840)]