20472545 has 8 divisors (see below), whose sum is σ = 24673896. Its totient is φ = 16306816.

The previous prime is 20472533. The next prime is 20472559. The reversal of 20472545 is 54527402.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1401856 + 19070689 = 1184^2 + 4367^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 20472545 - 2¹² = 20468449 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7622 + ... + 9951.

It is an arithmetic number, because the mean of its divisors is an integer number (3084237).

Almost surely, 2^20472545 is an apocalyptic number.

It is an amenable number.

20472545 is a deficient number, since it is larger than the sum of its proper divisors (4201351).

20472545 is a wasteful number, since it uses less digits than its factorization.

20472545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17811.

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

The square root of 20472545 is about 4524.6596557089. The cubic root of 20472545 is about 273.5629498594.

Adding to 20472545 its reverse (54527402), we get a palindrome (74999947).

The spelling of 20472545 in words is "twenty million, four hundred seventy-two thousand, five hundred forty-five".