20434434231 has 16 divisors (see below), whose sum is σ = 29134250208. Its totient is φ = 12694656000.

The previous prime is 20434434221. The next prime is 20434434271. The reversal of 20434434231 is 13243443402.

It is a happy number.

It is not a de Polignac number, because 20434434231 - 2¹⁰ = 20434433207 is a prime.

It is a super-2 number, since 2×20434434231² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20434434211) 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, 1978390 + ... + 1988691.

It is an arithmetic number, because the mean of its divisors is an integer number (1820890638).

Almost surely, 2^20434434231 is an apocalyptic number.

20434434231 is a deficient number, since it is larger than the sum of its proper divisors (8699815977).

20434434231 is a wasteful number, since it uses less digits than its factorization.

20434434231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3967202.

The product of its (nonzero) digits is 27648, while the sum is 30.

Adding to 20434434231 its reverse (13243443402), we get a palindrome (33677877633).

The spelling of 20434434231 in words is "twenty billion, four hundred thirty-four million, four hundred thirty-four thousand, two hundred thirty-one".