21678280

素因数分解:

$2^3\times 5^1\times {\mathrm{13}}^1\times {\mathrm{47}}^1\times {\mathrm{887}}^1$

素因数の和:958

約数の個数: 64

約数和(自身を含む): 53706240

約数和(自身を除く): 32027960

約数列:

[1, 2, 4, 5, 8, 10, 13, 20, 26, 40, 47, 52, 65, 94, 104, 130, 188, 235, 260, 376, 470, 520, 611, 887, 940, 1222, 1774, 1880, 2444, 3055, 3548, 4435, 4888, 6110, 7096, 8870, 11531, 12220, 17740, 23062, 24440, 35480, 41689, 46124, 57655, 83378, 92248, 115310, 166756, 208445, 230620, 333512, 416890, 461240, 541957, 833780, 1083914, 1667560, 2167828, 2709785, 4335656, 5419570, 10839140, 21678280]

約数ペア:

[(1, 21678280), (2, 10839140), (4, 5419570), (5, 4335656), (8, 2709785), (10, 2167828), (13, 1667560), (20, 1083914), (26, 833780), (40, 541957), (47, 461240), (52, 416890), (65, 333512), (94, 230620), (104, 208445), (130, 166756), (188, 115310), (235, 92248), (260, 83378), (376, 57655), (470, 46124), (520, 41689), (611, 35480), (887, 24440), (940, 23062), (1222, 17740), (1774, 12220), (1880, 11531), (2444, 8870), (3055, 7096), (3548, 6110), (4435, 4888)]