20958071 has 4 divisors (see below), whose sum is σ = 21445512. Its totient is φ = 20470632.

The previous prime is 20958053. The next prime is 20958073. The reversal of 20958071 is 17085902.

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 20958071 - 2²² = 16763767 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20958073) 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, 243656 + ... + 243741.

It is an arithmetic number, because the mean of its divisors is an integer number (5361378).

Almost surely, 2^20958071 is an apocalyptic number.

20958071 is a deficient number, since it is larger than the sum of its proper divisors (487441).

20958071 is an equidigital number, since it uses as much as digits as its factorization.

20958071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 487440.

The product of its (nonzero) digits is 5040, while the sum is 32.

The square root of 20958071 is about 4577.9985801658. The cubic root of 20958071 is about 275.7086779457.

The spelling of 20958071 in words is "twenty million, nine hundred fifty-eight thousand, seventy-one".