20429297 has 4 divisors (see below), whose sum is σ = 23347776. Its totient is φ = 17510820.

The previous prime is 20429273. The next prime is 20429309. The reversal of 20429297 is 79292402.

It is a happy number.

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 20429297 - 2¹⁰ = 20428273 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20426297) 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, 1459229 + ... + 1459242.

It is an arithmetic number, because the mean of its divisors is an integer number (5836944).

Almost surely, 2^20429297 is an apocalyptic number.

It is an amenable number.

20429297 is a deficient number, since it is larger than the sum of its proper divisors (2918479).

20429297 is an equidigital number, since it uses as much as digits as its factorization.

20429297 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2918478.

The product of its (nonzero) digits is 18144, while the sum is 35.

The square root of 20429297 is about 4519.8779850788. The cubic root of 20429297 is about 273.3701812641.

The spelling of 20429297 in words is "twenty million, four hundred twenty-nine thousand, two hundred ninety-seven".