20019687629 has 16 divisors (see below), whose sum is σ = 20369534640. Its totient is φ = 19673280000.

The previous prime is 20019687617. The next prime is 20019687637. The reversal of 20019687629 is 92678691002.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 1183497604 + 18836190025 = 34402^2 + 137245^2 .

It is a cyclic number.

It is not a de Polignac number, because 20019687629 - 2⁴ = 20019687613 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20019687229) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15154289 + ... + 15155609.

It is an arithmetic number, because the mean of its divisors is an integer number (1273095915).

Almost surely, 2^20019687629 is an apocalyptic number.

It is an amenable number.

20019687629 is a deficient number, since it is larger than the sum of its proper divisors (349847011).

20019687629 is a wasteful number, since it uses less digits than its factorization.

20019687629 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2432.

The product of its (nonzero) digits is 653184, while the sum is 50.

The spelling of 20019687629 in words is "twenty billion, nineteen million, six hundred eighty-seven thousand, six hundred twenty-nine".