21489880

素因数分解:

$2^3\times 5^1\times {\mathrm{107}}^1\times {\mathrm{5021}}^1$

素因数の和:5139

約数の個数: 32

約数和(自身を含む): 48813840

約数和(自身を除く): 27323960

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 107, 214, 428, 535, 856, 1070, 2140, 4280, 5021, 10042, 20084, 25105, 40168, 50210, 100420, 200840, 537247, 1074494, 2148988, 2686235, 4297976, 5372470, 10744940, 21489880]

約数ペア:

[(1, 21489880), (2, 10744940), (4, 5372470), (5, 4297976), (8, 2686235), (10, 2148988), (20, 1074494), (40, 537247), (107, 200840), (214, 100420), (428, 50210), (535, 40168), (856, 25105), (1070, 20084), (2140, 10042), (4280, 5021)]