20645853578 has 8 divisors (see below), whose sum is σ = 35392891872. Its totient is φ = 8848222956.

The previous prime is 20645853577. The next prime is 20645853581. The reversal of 20645853578 is 87535854602.

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

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20645853577) 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, 737351900 + ... + 737351927.

It is an arithmetic number, because the mean of its divisors is an integer number (4424111484).

Almost surely, 2^20645853578 is an apocalyptic number.

20645853578 is a deficient number, since it is larger than the sum of its proper divisors (14747038294).

20645853578 is a wasteful number, since it uses less digits than its factorization.

20645853578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1474703836.

The product of its (nonzero) digits is 8064000, while the sum is 53.

The spelling of 20645853578 in words is "twenty billion, six hundred forty-five million, eight hundred fifty-three thousand, five hundred seventy-eight".