21184940

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{389}}^2$

素因数の和:794

約数の個数: 36

約数和(自身を含む): 50974896

約数和(自身を除く): 29789956

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 70, 140, 389, 778, 1556, 1945, 2723, 3890, 5446, 7780, 10892, 13615, 27230, 54460, 151321, 302642, 605284, 756605, 1059247, 1513210, 2118494, 3026420, 4236988, 5296235, 10592470, 21184940]

約数ペア:

[(1, 21184940), (2, 10592470), (4, 5296235), (5, 4236988), (7, 3026420), (10, 2118494), (14, 1513210), (20, 1059247), (28, 756605), (35, 605284), (70, 302642), (140, 151321), (389, 54460), (778, 27230), (1556, 13615), (1945, 10892), (2723, 7780), (3890, 5446)]