20947029 has 4 divisors (see below), whose sum is σ = 27929376. Its totient is φ = 13964684.

The previous prime is 20947027. The next prime is 20947033. The reversal of 20947029 is 92074902.

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 20947029 - 2¹ = 20947027 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20947021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3491169 + ... + 3491174.

It is an arithmetic number, because the mean of its divisors is an integer number (6982344).

Almost surely, 2^20947029 is an apocalyptic number.

It is an amenable number.

20947029 is a deficient number, since it is larger than the sum of its proper divisors (6982347).

20947029 is an equidigital number, since it uses as much as digits as its factorization.

20947029 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6982346.

The product of its (nonzero) digits is 9072, while the sum is 33.

The square root of 20947029 is about 4576.7924357567. The cubic root of 20947029 is about 275.6602493469.

The spelling of 20947029 in words is "twenty million, nine hundred forty-seven thousand, twenty-nine".