21261280

素因数分解:

$2^5\times 5^1\times {\mathrm{83}}^1\times {\mathrm{1601}}^1$

素因数の和:1699

約数の個数: 48

約数和(自身を含む): 50866704

約数和(自身を除く): 29605424

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 80, 83, 160, 166, 332, 415, 664, 830, 1328, 1601, 1660, 2656, 3202, 3320, 6404, 6640, 8005, 12808, 13280, 16010, 25616, 32020, 51232, 64040, 128080, 132883, 256160, 265766, 531532, 664415, 1063064, 1328830, 2126128, 2657660, 4252256, 5315320, 10630640, 21261280]

約数ペア:

[(1, 21261280), (2, 10630640), (4, 5315320), (5, 4252256), (8, 2657660), (10, 2126128), (16, 1328830), (20, 1063064), (32, 664415), (40, 531532), (80, 265766), (83, 256160), (160, 132883), (166, 128080), (332, 64040), (415, 51232), (664, 32020), (830, 25616), (1328, 16010), (1601, 13280), (1660, 12808), (2656, 8005), (3202, 6640), (3320, 6404)]