20678949850 has 72 divisors (see below), whose sum is σ = 42080158260. Its totient is φ = 7556290560.

The previous prime is 20678949847. The next prime is 20678949857. The reversal of 20678949850 is 5894987602.

It can be written as a sum of positive squares in 18 ways, for example, as 11265487321 + 9413462529 = 106139^2 + 97023^2 .

It is not an unprimeable number, because it can be changed into a prime (20678949857) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 807036 + ... + 832264.

Almost surely, 2^20678949850 is an apocalyptic number.

20678949850 is an abundant number, since it is smaller than the sum of its proper divisors (21401208410).

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

20678949850 is a wasteful number, since it uses less digits than its factorization.

20678949850 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25364 (or 25346 counting only the distinct ones).

The product of its (nonzero) digits is 8709120, while the sum is 58.

The spelling of 20678949850 in words is "twenty billion, six hundred seventy-eight million, nine hundred forty-nine thousand, eight hundred fifty".