20470070721 has 8 divisors (see below), whose sum is σ = 27413663904. Its totient is φ = 13586595680.

The previous prime is 20470070713. The next prime is 20470070759. The reversal of 20470070721 is 12707007402.

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 20470070721 - 2³ = 20470070713 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20470070711) 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, 15028740 + ... + 15030101.

It is an arithmetic number, because the mean of its divisors is an integer number (3426707988).

Almost surely, 2^20470070721 is an apocalyptic number.

It is an amenable number.

20470070721 is a deficient number, since it is larger than the sum of its proper divisors (6943593183).

20470070721 is a wasteful number, since it uses less digits than its factorization.

20470070721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30059071.

The product of its (nonzero) digits is 5488, while the sum is 30.

The spelling of 20470070721 in words is "twenty billion, four hundred seventy million, seventy thousand, seven hundred twenty-one".