20731672047 has 32 divisors (see below), whose sum is σ = 29059130880. Its totient is φ = 13128635520.

The previous prime is 20731672043. The next prime is 20731672067. The reversal of 20731672047 is 74027613702.

It is not a de Polignac number, because 20731672047 - 2² = 20731672043 is a prime.

It is a super-2 number, since 2×20731672047² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20731671996 and 20731672014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20731672043) 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, 5903022 + ... + 5906532.

It is an arithmetic number, because the mean of its divisors is an integer number (908097840).

Almost surely, 2^20731672047 is an apocalyptic number.

20731672047 is a deficient number, since it is larger than the sum of its proper divisors (8327458833).

20731672047 is a wasteful number, since it uses less digits than its factorization.

20731672047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4623.

The product of its (nonzero) digits is 98784, while the sum is 39.

The spelling of 20731672047 in words is "twenty billion, seven hundred thirty-one million, six hundred seventy-two thousand, forty-seven".