20394697829 has 4 divisors (see below), whose sum is σ = 22248761280. Its totient is φ = 18540634380.

The previous prime is 20394697783. The next prime is 20394697861. The reversal of 20394697829 is 92879649302.

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 20394697829 - 2¹² = 20394693733 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 (20394997829) 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, 927031709 + ... + 927031730.

It is an arithmetic number, because the mean of its divisors is an integer number (5562190320).

Almost surely, 2^20394697829 is an apocalyptic number.

It is an amenable number.

20394697829 is a deficient number, since it is larger than the sum of its proper divisors (1854063451).

20394697829 is a wasteful number, since it uses less digits than its factorization.

20394697829 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1854063450.

The product of its (nonzero) digits is 11757312, while the sum is 59.

The spelling of 20394697829 in words is "twenty billion, three hundred ninety-four million, six hundred ninety-seven thousand, eight hundred twenty-nine".