20431267647 has 16 divisors (see below), whose sum is σ = 31204293120. Its totient is φ = 11648410272.

The previous prime is 20431267627. The next prime is 20431267693. The reversal of 20431267647 is 74676213402.

It is not a de Polignac number, because 20431267647 - 2⁶ = 20431267583 is a prime.

It is a super-4 number, since 4×20431267647⁴ (a number of 42 digits) contains 4444 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20431267599 and 20431267608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20431267627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1098888 + ... + 1117325.

It is an arithmetic number, because the mean of its divisors is an integer number (1950268320).

Almost surely, 2^20431267647 is an apocalyptic number.

20431267647 is a deficient number, since it is larger than the sum of its proper divisors (10773025473).

20431267647 is a wasteful number, since it uses less digits than its factorization.

20431267647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2216662.

The product of its (nonzero) digits is 338688, while the sum is 42.

The spelling of 20431267647 in words is "twenty billion, four hundred thirty-one million, two hundred sixty-seven thousand, six hundred forty-seven".