20455040

素因数分解:

$2^7\times 5^1\times {\mathrm{31}}^1\times {\mathrm{1031}}^1$

素因数の和:1081

約数の個数: 64

約数和(自身を含む): 50526720

約数和(自身を除く): 30071680

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 31, 32, 40, 62, 64, 80, 124, 128, 155, 160, 248, 310, 320, 496, 620, 640, 992, 1031, 1240, 1984, 2062, 2480, 3968, 4124, 4960, 5155, 8248, 9920, 10310, 16496, 19840, 20620, 31961, 32992, 41240, 63922, 65984, 82480, 127844, 131968, 159805, 164960, 255688, 319610, 329920, 511376, 639220, 659840, 1022752, 1278440, 2045504, 2556880, 4091008, 5113760, 10227520, 20455040]

約数ペア:

[(1, 20455040), (2, 10227520), (4, 5113760), (5, 4091008), (8, 2556880), (10, 2045504), (16, 1278440), (20, 1022752), (31, 659840), (32, 639220), (40, 511376), (62, 329920), (64, 319610), (80, 255688), (124, 164960), (128, 159805), (155, 131968), (160, 127844), (248, 82480), (310, 65984), (320, 63922), (496, 41240), (620, 32992), (640, 31961), (992, 20620), (1031, 19840), (1240, 16496), (1984, 10310), (2062, 9920), (2480, 8248), (3968, 5155), (4124, 4960)]