20524997 has 4 divisors (see below), whose sum is σ = 21605280. Its totient is φ = 19444716.

The previous prime is 20524991. The next prime is 20525009. The reversal of 20524997 is 79942502.

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 20524997 - 2¹⁰ = 20523973 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20524997.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20524991) 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, 540113 + ... + 540150.

It is an arithmetic number, because the mean of its divisors is an integer number (5401320).

Almost surely, 2^20524997 is an apocalyptic number.

It is an amenable number.

20524997 is a deficient number, since it is larger than the sum of its proper divisors (1080283).

20524997 is a wasteful number, since it uses less digits than its factorization.

20524997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1080282.

The product of its (nonzero) digits is 45360, while the sum is 38.

The square root of 20524997 is about 4530.4521849370. The cubic root of 20524997 is about 273.7963793454.

The spelling of 20524997 in words is "twenty million, five hundred twenty-four thousand, nine hundred ninety-seven".