20564355146 has 8 divisors (see below), whose sum is σ = 30863458944. Its totient is φ = 10276535500.

The previous prime is 20564355143. The next prime is 20564355157. The reversal of 20564355146 is 64155346502.

It is a happy number.

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

It is not an unprimeable number, because it can be changed into a prime (20564355143) 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, 2816480 + ... + 2823771.

It is an arithmetic number, because the mean of its divisors is an integer number (3857932368).

Almost surely, 2^20564355146 is an apocalyptic number.

20564355146 is a deficient number, since it is larger than the sum of its proper divisors (10299103798).

20564355146 is a wasteful number, since it uses less digits than its factorization.

20564355146 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5642076.

The product of its (nonzero) digits is 432000, while the sum is 41.

The spelling of 20564355146 in words is "twenty billion, five hundred sixty-four million, three hundred fifty-five thousand, one hundred forty-six".