20937528907 has 4 divisors (see below), whose sum is σ = 20938421680. Its totient is φ = 20936636136.

The previous prime is 20937528901. The next prime is 20937528923. The reversal of 20937528907 is 70982573902.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20937528907 is a prime.

It is a super-2 number, since 2×20937528907² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20937528901) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 410232 + ... + 458437.

It is an arithmetic number, because the mean of its divisors is an integer number (5234605420).

Almost surely, 2^20937528907 is an apocalyptic number.

20937528907 is a deficient number, since it is larger than the sum of its proper divisors (892773).

20937528907 is an equidigital number, since it uses as much as digits as its factorization.

20937528907 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 892772.

The product of its (nonzero) digits is 1905120, while the sum is 52.

The spelling of 20937528907 in words is "twenty billion, nine hundred thirty-seven million, five hundred twenty-eight thousand, nine hundred seven".