20269523 has 4 divisors (see below), whose sum is σ = 21336360. Its totient is φ = 19202688.

The previous prime is 20269519. The next prime is 20269541. The reversal of 20269523 is 32596202.

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

It is a cyclic number.

It is not a de Polignac number, because 20269523 - 2² = 20269519 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20269553) 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, 533390 + ... + 533427.

It is an arithmetic number, because the mean of its divisors is an integer number (5334090).

Almost surely, 2^20269523 is an apocalyptic number.

20269523 is a deficient number, since it is larger than the sum of its proper divisors (1066837).

20269523 is a wasteful number, since it uses less digits than its factorization.

20269523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1066836.

The product of its (nonzero) digits is 6480, while the sum is 29.

The square root of 20269523 is about 4502.1686996380. The cubic root of 20269523 is about 272.6556549761.

The spelling of 20269523 in words is "twenty million, two hundred sixty-nine thousand, five hundred twenty-three".