20626811 has 4 divisors (see below), whose sum is σ = 21292224. Its totient is φ = 19961400.

The previous prime is 20626789. The next prime is 20626841. The reversal of 20626811 is 11862602.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11862602 = 2 ⋅5931301.

It is a cyclic number.

It is not a de Polignac number, because 20626811 - 2⁶ = 20626747 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20626841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 332660 + ... + 332721.

It is an arithmetic number, because the mean of its divisors is an integer number (5323056).

Almost surely, 2^20626811 is an apocalyptic number.

20626811 is a deficient number, since it is larger than the sum of its proper divisors (665413).

20626811 is an equidigital number, since it uses as much as digits as its factorization.

20626811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 665412.

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 20626811 is about 4541.6749113075. The cubic root of 20626811 is about 274.2483540410.

The spelling of 20626811 in words is "twenty million, six hundred twenty-six thousand, eight hundred eleven".