20051057 has 8 divisors (see below), whose sum is σ = 21854784. Its totient is φ = 18284688.

The previous prime is 20051047. The next prime is 20051063. The reversal of 20051057 is 75015002.

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 20051057 - 2¹⁰ = 20050033 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20051047) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8213 + ... + 10370.

It is an arithmetic number, because the mean of its divisors is an integer number (2731848).

Almost surely, 2^20051057 is an apocalyptic number.

It is an amenable number.

20051057 is a deficient number, since it is larger than the sum of its proper divisors (1803727).

20051057 is a wasteful number, since it uses less digits than its factorization.

20051057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18679.

The product of its (nonzero) digits is 350, while the sum is 20.

The square root of 20051057 is about 4477.8406626409. The cubic root of 20051057 is about 271.6725487496.

Adding to 20051057 its reverse (75015002), we get a palindrome (95066059).

The spelling of 20051057 in words is "twenty million, fifty-one thousand, fifty-seven".