21397880

素因数分解:

$2^3\times 5^1\times 7^1\times {\mathrm{76421}}^1$

素因数の和:76439

約数の個数: 32

約数和(自身を含む): 55023840

約数和(自身を除く): 33625960

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 20, 28, 35, 40, 56, 70, 140, 280, 76421, 152842, 305684, 382105, 534947, 611368, 764210, 1069894, 1528420, 2139788, 2674735, 3056840, 4279576, 5349470, 10698940, 21397880]

約数ペア:

[(1, 21397880), (2, 10698940), (4, 5349470), (5, 4279576), (7, 3056840), (8, 2674735), (10, 2139788), (14, 1528420), (20, 1069894), (28, 764210), (35, 611368), (40, 534947), (56, 382105), (70, 305684), (140, 152842), (280, 76421)]