21510020

素因数分解:

$2^2\times 5^1\times 7^2\times {\mathrm{47}}^1\times {\mathrm{467}}^1$

素因数の和:537

約数の個数: 72

約数和(自身を含む): 53778816

約数和(自身を除く): 32268796

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 47, 49, 70, 94, 98, 140, 188, 196, 235, 245, 329, 467, 470, 490, 658, 934, 940, 980, 1316, 1645, 1868, 2303, 2335, 3269, 3290, 4606, 4670, 6538, 6580, 9212, 9340, 11515, 13076, 16345, 21949, 22883, 23030, 32690, 43898, 45766, 46060, 65380, 87796, 91532, 109745, 114415, 153643, 219490, 228830, 307286, 438980, 457660, 614572, 768215, 1075501, 1536430, 2151002, 3072860, 4302004, 5377505, 10755010, 21510020]

約数ペア:

[(1, 21510020), (2, 10755010), (4, 5377505), (5, 4302004), (7, 3072860), (10, 2151002), (14, 1536430), (20, 1075501), (28, 768215), (35, 614572), (47, 457660), (49, 438980), (70, 307286), (94, 228830), (98, 219490), (140, 153643), (188, 114415), (196, 109745), (235, 91532), (245, 87796), (329, 65380), (467, 46060), (470, 45766), (490, 43898), (658, 32690), (934, 23030), (940, 22883), (980, 21949), (1316, 16345), (1645, 13076), (1868, 11515), (2303, 9340), (2335, 9212), (3269, 6580), (3290, 6538), (4606, 4670)]