20216057 has 8 divisors (see below), whose sum is σ = 22205760. Its totient is φ = 18318960.

The previous prime is 20216047. The next prime is 20216069. The reversal of 20216057 is 75061202.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20216057 - 2¹⁰ = 20215033 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20216017) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22694 + ... + 23567.

It is an arithmetic number, because the mean of its divisors is an integer number (2775720).

Almost surely, 2^20216057 is an apocalyptic number.

It is an amenable number.

20216057 is a deficient number, since it is larger than the sum of its proper divisors (1989703).

20216057 is a wasteful number, since it uses less digits than its factorization.

20216057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46303.

The product of its (nonzero) digits is 840, while the sum is 23.

The square root of 20216057 is about 4496.2269738082. The cubic root of 20216057 is about 272.4157111021.

Adding to 20216057 its reverse (75061202), we get a palindrome (95277259).

The spelling of 20216057 in words is "twenty million, two hundred sixteen thousand, fifty-seven".