20505059437 has 4 divisors (see below), whose sum is σ = 20570992416. Its totient is φ = 20439126460.

The previous prime is 20505059417. The next prime is 20505059513. The reversal of 20505059437 is 73495050502.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20505059437 - 2²³ = 20496670829 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20505059437.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20505059417) 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, 32966023 + ... + 32966644.

It is an arithmetic number, because the mean of its divisors is an integer number (5142748104).

Almost surely, 2^20505059437 is an apocalyptic number.

It is an amenable number.

20505059437 is a deficient number, since it is larger than the sum of its proper divisors (65932979).

20505059437 is an equidigital number, since it uses as much as digits as its factorization.

20505059437 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65932978.

The product of its (nonzero) digits is 189000, while the sum is 40.

The spelling of 20505059437 in words is "twenty billion, five hundred five million, fifty-nine thousand, four hundred thirty-seven".