20143135431 has 32 divisors (see below), whose sum is σ = 31249451520. Its totient is φ = 12799397952.

The previous prime is 20143135417. The next prime is 20143135447. The reversal of 20143135431 is 13453134102.

It is a happy number.

It is not a de Polignac number, because 20143135431 - 2²¹ = 20141038279 is a prime.

It is a super-2 number, since 2×20143135431² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 20143135395 and 20143135404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20143175431) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 118435 + ... + 233051.

It is an arithmetic number, because the mean of its divisors is an integer number (976545360).

Almost surely, 2^20143135431 is an apocalyptic number.

20143135431 is a deficient number, since it is larger than the sum of its proper divisors (11106316089).

20143135431 is a wasteful number, since it uses less digits than its factorization.

20143135431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114932 (or 114926 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

Adding to 20143135431 its reverse (13453134102), we get a palindrome (33596269533).

The spelling of 20143135431 in words is "twenty billion, one hundred forty-three million, one hundred thirty-five thousand, four hundred thirty-one".