20702760021 has 24 divisors (see below), whose sum is σ = 31872769344. Its totient is φ = 12903926400.

The previous prime is 20702760019. The next prime is 20702760037. The reversal of 20702760021 is 12006720702.

It is not a de Polignac number, because 20702760021 - 2¹ = 20702760019 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20702760011) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 424951 + ... + 471156.

It is an arithmetic number, because the mean of its divisors is an integer number (1328032056).

Almost surely, 2^20702760021 is an apocalyptic number.

It is an amenable number.

20702760021 is a deficient number, since it is larger than the sum of its proper divisors (11170009323).

20702760021 is a wasteful number, since it uses less digits than its factorization.

20702760021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 896281 (or 896278 counting only the distinct ones).

The product of its (nonzero) digits is 2352, while the sum is 27.

The spelling of 20702760021 in words is "twenty billion, seven hundred two million, seven hundred sixty thousand, twenty-one".