20471664450 has 24 divisors (see below), whose sum is σ = 50769728208. Its totient is φ = 5459110480.

The previous prime is 20471664431. The next prime is 20471664467. The reversal of 20471664450 is 5446617402.

It is a junction number, because it is equal to n+sod(n) for n = 20471664399 and 20471664408.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 68238732 + ... + 68239031.

It is an arithmetic number, because the mean of its divisors is an integer number (2115405342).

Almost surely, 2^20471664450 is an apocalyptic number.

20471664450 is an abundant number, since it is smaller than the sum of its proper divisors (30298063758).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20471664450 is a wasteful number, since it uses less digits than its factorization.

20471664450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136477778 (or 136477773 counting only the distinct ones).

The product of its (nonzero) digits is 161280, while the sum is 39.

The spelling of 20471664450 in words is "twenty billion, four hundred seventy-one million, six hundred sixty-four thousand, four hundred fifty".