20400203211 has 16 divisors (see below), whose sum is σ = 28485383424. Its totient is φ = 12961849824.

The previous prime is 20400203209. The next prime is 20400203249. The reversal of 20400203211 is 11230200402.

It is not a de Polignac number, because 20400203211 - 2¹ = 20400203209 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20400203281) 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, 514561 + ... + 552786.

It is an arithmetic number, because the mean of its divisors is an integer number (1780336464).

Almost surely, 2^20400203211 is an apocalyptic number.

20400203211 is a deficient number, since it is larger than the sum of its proper divisors (8085180213).

20400203211 is a wasteful number, since it uses less digits than its factorization.

20400203211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1067650.

The product of its (nonzero) digits is 96, while the sum is 15.

Adding to 20400203211 its reverse (11230200402), we get a palindrome (31630403613).

It can be divided in two parts, 2040020 and 3211, that added together give a triangular number (2043231 = T₂₀₂₁).

The spelling of 20400203211 in words is "twenty billion, four hundred million, two hundred three thousand, two hundred eleven".