20986880

素因数分解:

$2^{10}\times 5^1\times {\mathrm{4099}}^1$

素因数の和:4124

約数の個数: 44

約数和(自身を含む): 50356200

約数和(自身を除く): 29369320

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 80, 128, 160, 256, 320, 512, 640, 1024, 1280, 2560, 4099, 5120, 8198, 16396, 20495, 32792, 40990, 65584, 81980, 131168, 163960, 262336, 327920, 524672, 655840, 1049344, 1311680, 2098688, 2623360, 4197376, 5246720, 10493440, 20986880]

約数ペア:

[(1, 20986880), (2, 10493440), (4, 5246720), (5, 4197376), (8, 2623360), (10, 2098688), (16, 1311680), (20, 1049344), (32, 655840), (40, 524672), (64, 327920), (80, 262336), (128, 163960), (160, 131168), (256, 81980), (320, 65584), (512, 40990), (640, 32792), (1024, 20495), (1280, 16396), (2560, 8198), (4099, 5120)]