20523211 has 12 divisors (see below), whose sum is σ = 21869400. Its totient is φ = 19255968.

The previous prime is 20523203. The next prime is 20523221. The reversal of 20523211 is 11232502.

It is not a de Polignac number, because 20523211 - 2³ = 20523203 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20523221) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 49975 + ... + 50383.

It is an arithmetic number, because the mean of its divisors is an integer number (1822450).

Almost surely, 2^20523211 is an apocalyptic number.

20523211 is a deficient number, since it is larger than the sum of its proper divisors (1346189).

20523211 is a wasteful number, since it uses less digits than its factorization.

20523211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 586 (or 567 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 20523211 is about 4530.2550700816. The cubic root of 20523211 is about 273.7884375737.

Adding to 20523211 its reverse (11232502), we get a palindrome (31755713).

The spelling of 20523211 in words is "twenty million, five hundred twenty-three thousand, two hundred eleven".