20245723 has 4 divisors (see below), whose sum is σ = 20393640. Its totient is φ = 20097808.

The previous prime is 20245711. The next prime is 20245739. The reversal of 20245723 is 32754202.

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 20245723 - 2¹⁷ = 20114651 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20245123) 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, 73753 + ... + 74026.

It is an arithmetic number, because the mean of its divisors is an integer number (5098410).

Almost surely, 2^20245723 is an apocalyptic number.

20245723 is a deficient number, since it is larger than the sum of its proper divisors (147917).

20245723 is a wasteful number, since it uses less digits than its factorization.

20245723 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147916.

The product of its (nonzero) digits is 3360, while the sum is 25.

The square root of 20245723 is about 4499.5247526822. The cubic root of 20245723 is about 272.5488978828.

Adding to 20245723 its reverse (32754202), we get a palindrome (52999925).

The spelling of 20245723 in words is "twenty million, two hundred forty-five thousand, seven hundred twenty-three".