20403021111 has 16 divisors (see below), whose sum is σ = 30479207808. Its totient is φ = 12031264800.

The previous prime is 20403021097. The next prime is 20403021113. The reversal of 20403021111 is 11112030402.

It is not a de Polignac number, because 20403021111 - 2⁷ = 20403020983 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20403021113) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8353825 + ... + 8356266.

It is an arithmetic number, because the mean of its divisors is an integer number (1904950488).

Almost surely, 2^20403021111 is an apocalyptic number.

20403021111 is a deficient number, since it is larger than the sum of its proper divisors (10076186697).

20403021111 is a wasteful number, since it uses less digits than its factorization.

20403021111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16710142.

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 20403021111 its reverse (11112030402), we get a palindrome (31515051513).

The spelling of 20403021111 in words is "twenty billion, four hundred three million, twenty-one thousand, one hundred eleven".