21039560

素因数分解:

$2^3\times 5^1\times {\mathrm{41}}^1\times {\mathrm{12829}}^1$

素因数の和:12881

約数の個数: 32

約数和(自身を含む): 48497400

約数和(自身を除く): 27457840

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 41, 82, 164, 205, 328, 410, 820, 1640, 12829, 25658, 51316, 64145, 102632, 128290, 256580, 513160, 525989, 1051978, 2103956, 2629945, 4207912, 5259890, 10519780, 21039560]

約数ペア:

[(1, 21039560), (2, 10519780), (4, 5259890), (5, 4207912), (8, 2629945), (10, 2103956), (20, 1051978), (40, 525989), (41, 513160), (82, 256580), (164, 128290), (205, 102632), (328, 64145), (410, 51316), (820, 25658), (1640, 12829)]