20691402048 has 140 divisors (see below), whose sum is σ = 64002940320. Its totient is φ = 6597220608.

The previous prime is 20691402047. The next prime is 20691402131. The reversal of 20691402048 is 84020419602.

20691402048 is a `hidden beast` number, since 206 + 9 + 1 + 402 + 0 + 48 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20691402047) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 32463 + ... + 206001.

Almost surely, 2^20691402048 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20691402048, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32001470160).

20691402048 is an abundant number, since it is smaller than the sum of its proper divisors (43311538272).

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

20691402048 is a wasteful number, since it uses less digits than its factorization.

20691402048 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173586 (or 173567 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 36.

The spelling of 20691402048 in words is "twenty billion, six hundred ninety-one million, four hundred two thousand, forty-eight".