20672056057 has 2 divisors, whose sum is σ = 20672056058. Its totient is φ = 20672056056.

The previous prime is 20672056043. The next prime is 20672056063. The reversal of 20672056057 is 75065027602.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16153393216 + 4518662841 = 127096^2 + 67221^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20672056057 is a prime.

It is not a weakly prime, because it can be changed into another prime (20672056087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10336028028 + 10336028029.

It is an arithmetic number, because the mean of its divisors is an integer number (10336028029).

Almost surely, 2^20672056057 is an apocalyptic number.

It is an amenable number.

20672056057 is a deficient number, since it is larger than the sum of its proper divisors (1).

20672056057 is an equidigital number, since it uses as much as digits as its factorization.

20672056057 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 176400, while the sum is 40.

The spelling of 20672056057 in words is "twenty billion, six hundred seventy-two million, fifty-six thousand, fifty-seven".