20651651047 has 8 divisors (see below), whose sum is σ = 21448119600. Its totient is φ = 19867725504.

The previous prime is 20651651039. The next prime is 20651651081. The reversal of 20651651047 is 74015615602.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20651651047 - 2³ = 20651651039 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20651650997 and 20651651015.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20651651947) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3132397 + ... + 3138982.

It is an arithmetic number, because the mean of its divisors is an integer number (2681014950).

Almost surely, 2^20651651047 is an apocalyptic number.

20651651047 is a deficient number, since it is larger than the sum of its proper divisors (796468553).

20651651047 is an equidigital number, since it uses as much as digits as its factorization.

20651651047 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6271505.

The product of its (nonzero) digits is 50400, while the sum is 37.

The spelling of 20651651047 in words is "twenty billion, six hundred fifty-one million, six hundred fifty-one thousand, forty-seven".