20469257 has 4 divisors (see below), whose sum is σ = 20484816. Its totient is φ = 20453700.

The previous prime is 20469233. The next prime is 20469311. The reversal of 20469257 is 75296402.

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 20469257 - 2²² = 16274953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20469217) 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, 5603 + ... + 8504.

It is an arithmetic number, because the mean of its divisors is an integer number (5121204).

Almost surely, 2^20469257 is an apocalyptic number.

It is an amenable number.

20469257 is a deficient number, since it is larger than the sum of its proper divisors (15559).

20469257 is a wasteful number, since it uses less digits than its factorization.

20469257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15558.

The product of its (nonzero) digits is 30240, while the sum is 35.

The square root of 20469257 is about 4524.2962988735. The cubic root of 20469257 is about 273.5483038520.

The spelling of 20469257 in words is "twenty million, four hundred sixty-nine thousand, two hundred fifty-seven".