20505880

素因数分解:

$2^3\times 5^1\times {\mathrm{23}}^1\times {\mathrm{31}}^1\times {\mathrm{719}}^1$

素因数の和:784

約数の個数: 64

約数和(自身を含む): 49766400

約数和(自身を除く): 29260520

約数列:

[1, 2, 4, 5, 8, 10, 20, 23, 31, 40, 46, 62, 92, 115, 124, 155, 184, 230, 248, 310, 460, 620, 713, 719, 920, 1240, 1426, 1438, 2852, 2876, 3565, 3595, 5704, 5752, 7130, 7190, 14260, 14380, 16537, 22289, 28520, 28760, 33074, 44578, 66148, 82685, 89156, 111445, 132296, 165370, 178312, 222890, 330740, 445780, 512647, 661480, 891560, 1025294, 2050588, 2563235, 4101176, 5126470, 10252940, 20505880]

約数ペア:

[(1, 20505880), (2, 10252940), (4, 5126470), (5, 4101176), (8, 2563235), (10, 2050588), (20, 1025294), (23, 891560), (31, 661480), (40, 512647), (46, 445780), (62, 330740), (92, 222890), (115, 178312), (124, 165370), (155, 132296), (184, 111445), (230, 89156), (248, 82685), (310, 66148), (460, 44578), (620, 33074), (713, 28760), (719, 28520), (920, 22289), (1240, 16537), (1426, 14380), (1438, 14260), (2852, 7190), (2876, 7130), (3565, 5752), (3595, 5704)]