20479357 has 4 divisors (see below), whose sum is σ = 20915136. Its totient is φ = 20043580.

The previous prime is 20479343. The next prime is 20479363. The reversal of 20479357 is 75397402.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20479357 - 2⁷ = 20479229 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 (20479367) 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, 217819 + ... + 217912.

It is an arithmetic number, because the mean of its divisors is an integer number (5228784).

Almost surely, 2^20479357 is an apocalyptic number.

It is an amenable number.

20479357 is a deficient number, since it is larger than the sum of its proper divisors (435779).

20479357 is an equidigital number, since it uses as much as digits as its factorization.

20479357 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 435778.

The product of its (nonzero) digits is 52920, while the sum is 37.

The square root of 20479357 is about 4525.4123569019. The cubic root of 20479357 is about 273.5932881192.

The spelling of 20479357 in words is "twenty million, four hundred seventy-nine thousand, three hundred fifty-seven".