19912840

素因数分解:

$2^3\times 5^1\times {\mathrm{61}}^1\times {\mathrm{8161}}^1$

素因数の和:8233

約数の個数: 32

約数和(自身を含む): 45543960

約数和(自身を除く): 25631120

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 61, 122, 244, 305, 488, 610, 1220, 2440, 8161, 16322, 32644, 40805, 65288, 81610, 163220, 326440, 497821, 995642, 1991284, 2489105, 3982568, 4978210, 9956420, 19912840]

約数ペア:

[(1, 19912840), (2, 9956420), (4, 4978210), (5, 3982568), (8, 2489105), (10, 1991284), (20, 995642), (40, 497821), (61, 326440), (122, 163220), (244, 81610), (305, 65288), (488, 40805), (610, 32644), (1220, 16322), (2440, 8161)]