20771331 has 32 divisors (see below), whose sum is σ = 33965568. Its totient is φ = 11020800.

The previous prime is 20771327. The next prime is 20771341. The reversal of 20771331 is 13317702.

It is not a de Polignac number, because 20771331 - 2² = 20771327 is a prime.

It is a super-2 number, since 2×20771331² = 862896383023122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20771341) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 29281 + ... + 29981.

It is an arithmetic number, because the mean of its divisors is an integer number (1061424).

Almost surely, 2^20771331 is an apocalyptic number.

20771331 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

20771331 is a deficient number, since it is larger than the sum of its proper divisors (13194237).

20771331 is a wasteful number, since it uses less digits than its factorization.

20771331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 811.

The product of its (nonzero) digits is 882, while the sum is 24.

The square root of 20771331 is about 4557.5575695761. The cubic root of 20771331 is about 274.8873632380.

The spelling of 20771331 in words is "twenty million, seven hundred seventy-one thousand, three hundred thirty-one".