20994132829 has 4 divisors (see below), whose sum is σ = 20997208540. Its totient is φ = 20991057120.

The previous prime is 20994132827. The next prime is 20994132869. The reversal of 20994132829 is 92823149902.

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

It can be written as a sum of positive squares in 2 ways, for example, as 5691948025 + 15302184804 = 75445^2 + 123702^2 .

It is a cyclic number.

It is not a de Polignac number, because 20994132829 - 2¹ = 20994132827 is a prime.

It is a super-2 number, since 2×20994132829² (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 (20994132827) 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, 1527594 + ... + 1541275.

It is an arithmetic number, because the mean of its divisors is an integer number (5249302135).

Almost surely, 2^20994132829 is an apocalyptic number.

It is an amenable number.

20994132829 is a deficient number, since it is larger than the sum of its proper divisors (3075711).

20994132829 is an equidigital number, since it uses as much as digits as its factorization.

20994132829 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3075710.

The product of its (nonzero) digits is 559872, while the sum is 49.

The spelling of 20994132829 in words is "twenty billion, nine hundred ninety-four million, one hundred thirty-two thousand, eight hundred twenty-nine".