21698420

素因数分解:

$2^2\times 5^1\times {\mathrm{389}}^1\times {\mathrm{2789}}^1$

素因数の和:3187

約数の個数: 24

約数和(自身を含む): 45700200

約数和(自身を除く): 24001780

約数列:

[1, 2, 4, 5, 10, 20, 389, 778, 1556, 1945, 2789, 3890, 5578, 7780, 11156, 13945, 27890, 55780, 1084921, 2169842, 4339684, 5424605, 10849210, 21698420]

約数ペア:

[(1, 21698420), (2, 10849210), (4, 5424605), (5, 4339684), (10, 2169842), (20, 1084921), (389, 55780), (778, 27890), (1556, 13945), (1945, 11156), (2789, 7780), (3890, 5578)]