20529438719 has 4 divisors (see below), whose sum is σ = 20540915880. Its totient is φ = 20517961560.

The previous prime is 20529438679. The next prime is 20529438773. The reversal of 20529438719 is 91783492502.

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

It is a cyclic number.

It is not a de Polignac number, because 20529438719 - 2¹² = 20529434623 is a prime.

It is a super-2 number, since 2×20529438719² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20529438619) 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, 5735897 + ... + 5739474.

It is an arithmetic number, because the mean of its divisors is an integer number (5135228970).

Almost surely, 2^20529438719 is an apocalyptic number.

20529438719 is a deficient number, since it is larger than the sum of its proper divisors (11477161).

20529438719 is a wasteful number, since it uses less digits than its factorization.

20529438719 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11477160.

The product of its (nonzero) digits is 1088640, while the sum is 50.

The spelling of 20529438719 in words is "twenty billion, five hundred twenty-nine million, four hundred thirty-eight thousand, seven hundred nineteen".