20570762645 has 4 divisors (see below), whose sum is σ = 24684915180. Its totient is φ = 16456610112.

The previous prime is 20570762599. The next prime is 20570762669. The reversal of 20570762645 is 54626707502.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 15532886161 + 5037876484 = 124631^2 + 70978^2 .

It is a cyclic number.

It is not a de Polignac number, because 20570762645 - 2²⁰ = 20569714069 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20570762596 and 20570762605.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2057076260 + ... + 2057076269.

It is an arithmetic number, because the mean of its divisors is an integer number (6171228795).

Almost surely, 2^20570762645 is an apocalyptic number.

It is an amenable number.

20570762645 is a deficient number, since it is larger than the sum of its proper divisors (4114152535).

20570762645 is an equidigital number, since it uses as much as digits as its factorization.

20570762645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4114152534.

The product of its (nonzero) digits is 705600, while the sum is 44.

The spelling of 20570762645 in words is "twenty billion, five hundred seventy million, seven hundred sixty-two thousand, six hundred forty-five".