20647321050 has 24 divisors (see below), whose sum is σ = 51205356576. Its totient is φ = 5505952240.

The previous prime is 20647321031. The next prime is 20647321067. The reversal of 20647321050 is 5012374602.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 20647320999 and 20647321017.

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, 68824254 + ... + 68824553.

It is an arithmetic number, because the mean of its divisors is an integer number (2133556524).

Almost surely, 2^20647321050 is an apocalyptic number.

20647321050 is an abundant number, since it is smaller than the sum of its proper divisors (30558035526).

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

20647321050 is a wasteful number, since it uses less digits than its factorization.

20647321050 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137648822 (or 137648817 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 30.

Adding to 20647321050 its reverse (5012374602), we get a palindrome (25659695652).

The spelling of 20647321050 in words is "twenty billion, six hundred forty-seven million, three hundred twenty-one thousand, fifty".