20131567447 has 4 divisors (see below), whose sum is σ = 20131852536. Its totient is φ = 20131282360.

The previous prime is 20131567381. The next prime is 20131567543. The reversal of 20131567447 is 74476513102.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 20131567447 - 2²⁷ = 19997349719 is a prime.

It is a super-2 number, since 2×20131567447² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20131967447) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50748 + ... + 206974.

It is an arithmetic number, because the mean of its divisors is an integer number (5032963134).

Almost surely, 2^20131567447 is an apocalyptic number.

20131567447 is a deficient number, since it is larger than the sum of its proper divisors (285089).

20131567447 is a wasteful number, since it uses less digits than its factorization.

20131567447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 285088.

The product of its (nonzero) digits is 141120, while the sum is 40.

The spelling of 20131567447 in words is "twenty billion, one hundred thirty-one million, five hundred sixty-seven thousand, four hundred forty-seven".