20047679 has 4 divisors (see below), whose sum is σ = 21102840. Its totient is φ = 18992520.

The previous prime is 20047667. The next prime is 20047681. The reversal of 20047679 is 97674002.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 97674002 = 2 ⋅48837001.

It is a cyclic number.

It is not a de Polignac number, because 20047679 - 2⁴ = 20047663 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 (20047609) 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, 527552 + ... + 527589.

It is an arithmetic number, because the mean of its divisors is an integer number (5275710).

Almost surely, 2^20047679 is an apocalyptic number.

20047679 is a deficient number, since it is larger than the sum of its proper divisors (1055161).

20047679 is a wasteful number, since it uses less digits than its factorization.

20047679 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1055160.

The product of its (nonzero) digits is 21168, while the sum is 35.

The square root of 20047679 is about 4477.4634560206. The cubic root of 20047679 is about 271.6572916751.

The spelling of 20047679 in words is "twenty million, forty-seven thousand, six hundred seventy-nine".