20005670509 has 8 divisors (see below), whose sum is σ = 21829170528. Its totient is φ = 18182970960.

The previous prime is 20005670507. The next prime is 20005670557. The reversal of 20005670509 is 90507650002.

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

It is not a de Polignac number, because 20005670509 - 2¹ = 20005670507 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20005670507) 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, 147247 + ... + 248380.

It is an arithmetic number, because the mean of its divisors is an integer number (2728646316).

Almost surely, 2^20005670509 is an apocalyptic number.

It is an amenable number.

20005670509 is a deficient number, since it is larger than the sum of its proper divisors (1823500019).

20005670509 is a wasteful number, since it uses less digits than its factorization.

20005670509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 400235.

The product of its (nonzero) digits is 18900, while the sum is 34.

The spelling of 20005670509 in words is "twenty billion, five million, six hundred seventy thousand, five hundred nine".