20826831 has 16 divisors (see below), whose sum is σ = 29399040. Its totient is φ = 13078080.

The previous prime is 20826809. The next prime is 20826859. The reversal of 20826831 is 13862802.

It is not a de Polignac number, because 20826831 - 2¹⁰ = 20825807 is a prime.

It is a super-2 number, since 2×20826831² = 867513779005122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20826881) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9931 + ... + 11843.

It is an arithmetic number, because the mean of its divisors is an integer number (1837440).

Almost surely, 2^20826831 is an apocalyptic number.

20826831 is a deficient number, since it is larger than the sum of its proper divisors (8572209).

20826831 is a wasteful number, since it uses less digits than its factorization.

20826831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2126.

The product of its (nonzero) digits is 4608, while the sum is 30.

The square root of 20826831 is about 4563.6422953601. The cubic root of 20826831 is about 275.1319741203.

The spelling of 20826831 in words is "twenty million, eight hundred twenty-six thousand, eight hundred thirty-one".