20472111 has 24 divisors (see below), whose sum is σ = 32544720. Its totient is φ = 12400080.

The previous prime is 20472107. The next prime is 20472113. The reversal of 20472111 is 11127402.

It is not a de Polignac number, because 20472111 - 2² = 20472107 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20472113) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11125 + ... + 12833.

It is an arithmetic number, because the mean of its divisors is an integer number (1356030).

Almost surely, 2^20472111 is an apocalyptic number.

20472111 is a deficient number, since it is larger than the sum of its proper divisors (12072609).

20472111 is a wasteful number, since it uses less digits than its factorization.

20472111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1748 (or 1723 counting only the distinct ones).

The product of its (nonzero) digits is 112, while the sum is 18.

The square root of 20472111 is about 4524.6116960464. The cubic root of 20472111 is about 273.5610167476.

Adding to 20472111 its reverse (11127402), we get a palindrome (31599513).

The spelling of 20472111 in words is "twenty million, four hundred seventy-two thousand, one hundred eleven".