20690538537 has 48 divisors (see below), whose sum is σ = 29013585216. Its totient is φ = 13113446400.

The previous prime is 20690538527. The next prime is 20690538571. The reversal of 20690538537 is 73583509602.

It is a happy number.

It is not a de Polignac number, because 20690538537 - 2¹⁹ = 20690014249 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20690538527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 67395738 + ... + 67396044.

It is an arithmetic number, because the mean of its divisors is an integer number (604449692).

Almost surely, 2^20690538537 is an apocalyptic number.

It is an amenable number.

20690538537 is a deficient number, since it is larger than the sum of its proper divisors (8323046679).

20690538537 is a wasteful number, since it uses less digits than its factorization.

20690538537 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 710 (or 679 counting only the distinct ones).

The product of its (nonzero) digits is 1360800, while the sum is 48.

The spelling of 20690538537 in words is "twenty billion, six hundred ninety million, five hundred thirty-eight thousand, five hundred thirty-seven".