20420461079 has 4 divisors (see below), whose sum is σ = 20499918384. Its totient is φ = 20341003776.

The previous prime is 20420461069. The next prime is 20420461091. The reversal of 20420461079 is 97016402402.

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 20420461079 - 2⁴ = 20420461063 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20420461069) 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, 39728267 + ... + 39728780.

It is an arithmetic number, because the mean of its divisors is an integer number (5124979596).

Almost surely, 2^20420461079 is an apocalyptic number.

20420461079 is a deficient number, since it is larger than the sum of its proper divisors (79457305).

20420461079 is an equidigital number, since it uses as much as digits as its factorization.

20420461079 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79457304.

The product of its (nonzero) digits is 24192, while the sum is 35.

The spelling of 20420461079 in words is "twenty billion, four hundred twenty million, four hundred sixty-one thousand, seventy-nine".