20920271 has 4 divisors (see below), whose sum is σ = 21829872. Its totient is φ = 20010672.

The previous prime is 20920259. The next prime is 20920301. The reversal of 20920271 is 17202902.

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 20920271 - 2¹⁴ = 20903887 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23), and also a Moran number because the ratio is a prime number: 909577 = 20920271 / (2 + 0 + 9 + 2 + 0 + 2 + 7 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20920201) 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, 454766 + ... + 454811.

It is an arithmetic number, because the mean of its divisors is an integer number (5457468).

Almost surely, 2^20920271 is an apocalyptic number.

20920271 is a deficient number, since it is larger than the sum of its proper divisors (909601).

20920271 is an equidigital number, since it uses as much as digits as its factorization.

20920271 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 909600.

The product of its (nonzero) digits is 504, while the sum is 23.

The square root of 20920271 is about 4573.8682753223. The cubic root of 20920271 is about 275.5428220344.

The spelling of 20920271 in words is "twenty million, nine hundred twenty thousand, two hundred seventy-one".