21301420

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{71}}^1\times {\mathrm{2143}}^1$

素因数の和:2230

約数の個数: 48

約数和(自身を含む): 51867648

約数和(自身を除く): 30566228

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 70, 71, 140, 142, 284, 355, 497, 710, 994, 1420, 1988, 2143, 2485, 4286, 4970, 8572, 9940, 10715, 15001, 21430, 30002, 42860, 60004, 75005, 150010, 152153, 300020, 304306, 608612, 760765, 1065071, 1521530, 2130142, 3043060, 4260284, 5325355, 10650710, 21301420]

約数ペア:

[(1, 21301420), (2, 10650710), (4, 5325355), (5, 4260284), (7, 3043060), (10, 2130142), (14, 1521530), (20, 1065071), (28, 760765), (35, 608612), (70, 304306), (71, 300020), (140, 152153), (142, 150010), (284, 75005), (355, 60004), (497, 42860), (710, 30002), (994, 21430), (1420, 15001), (1988, 10715), (2143, 9940), (2485, 8572), (4286, 4970)]