20136479 has 4 divisors (see below), whose sum is σ = 21967080. Its totient is φ = 18305880.

The previous prime is 20136463. The next prime is 20136481. The reversal of 20136479 is 97463102.

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 20136479 - 2⁴ = 20136463 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 (20136419) 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, 915284 + ... + 915305.

It is an arithmetic number, because the mean of its divisors is an integer number (5491770).

Almost surely, 2^20136479 is an apocalyptic number.

20136479 is a deficient number, since it is larger than the sum of its proper divisors (1830601).

20136479 is a wasteful number, since it uses less digits than its factorization.

20136479 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1830600.

The product of its (nonzero) digits is 9072, while the sum is 32.

The square root of 20136479 is about 4487.3688281665. The cubic root of 20136479 is about 272.0577975144.

The spelling of 20136479 in words is "twenty million, one hundred thirty-six thousand, four hundred seventy-nine".