20724545 has 8 divisors (see below), whose sum is σ = 25220160. Its totient is φ = 16345840.

The previous prime is 20724521. The next prime is 20724553. The reversal of 20724545 is 54542702.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20724545 - 2¹² = 20720449 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28835 + ... + 29544.

It is an arithmetic number, because the mean of its divisors is an integer number (3152520).

Almost surely, 2^20724545 is an apocalyptic number.

It is an amenable number.

20724545 is a deficient number, since it is larger than the sum of its proper divisors (4495615).

20724545 is an equidigital number, since it uses as much as digits as its factorization.

20724545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58455.

The product of its (nonzero) digits is 11200, while the sum is 29.

The square root of 20724545 is about 4552.4218829102. The cubic root of 20724545 is about 274.6808197677.

The spelling of 20724545 in words is "twenty million, seven hundred twenty-four thousand, five hundred forty-five".