20870079 has 4 divisors (see below), whose sum is σ = 27826776. Its totient is φ = 13913384.

The previous prime is 20870077. The next prime is 20870089. The reversal of 20870079 is 97007802.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20870079 - 2¹ = 20870077 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20870071) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3478344 + ... + 3478349.

It is an arithmetic number, because the mean of its divisors is an integer number (6956694).

Almost surely, 2^20870079 is an apocalyptic number.

20870079 is a deficient number, since it is larger than the sum of its proper divisors (6956697).

20870079 is an equidigital number, since it uses as much as digits as its factorization.

20870079 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6956696.

The product of its (nonzero) digits is 7056, while the sum is 33.

The square root of 20870079 is about 4568.3781586029. The cubic root of 20870079 is about 275.3222844123.

The spelling of 20870079 in words is "twenty million, eight hundred seventy thousand, seventy-nine".