20261823 has 4 divisors (see below), whose sum is σ = 27015768. Its totient is φ = 13507880.

The previous prime is 20261803. The next prime is 20261861. The reversal of 20261823 is 32816202.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20261823 - 2⁸ = 20261567 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20261793 and 20261802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20261803) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3376968 + ... + 3376973.

It is an arithmetic number, because the mean of its divisors is an integer number (6753942).

Almost surely, 2^20261823 is an apocalyptic number.

20261823 is a deficient number, since it is larger than the sum of its proper divisors (6753945).

20261823 is an equidigital number, since it uses as much as digits as its factorization.

20261823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6753944.

The product of its (nonzero) digits is 1152, while the sum is 24.

The square root of 20261823 is about 4501.3134749759. The cubic root of 20261823 is about 272.6211250656.

The spelling of 20261823 in words is "twenty million, two hundred sixty-one thousand, eight hundred twenty-three".