20472515 has 32 divisors (see below), whose sum is σ = 29331456. Its totient is φ = 13426560.

The previous prime is 20472511. The next prime is 20472533. The reversal of 20472515 is 51527402.

It is not a de Polignac number, because 20472515 - 2² = 20472511 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20472511) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 91694 + ... + 91916.

It is an arithmetic number, because the mean of its divisors is an integer number (916608).

Almost surely, 2^20472515 is an apocalyptic number.

20472515 is a deficient number, since it is larger than the sum of its proper divisors (8858941).

20472515 is a wasteful number, since it uses less digits than its factorization.

20472515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 339.

The product of its (nonzero) digits is 2800, while the sum is 26.

The square root of 20472515 is about 4524.6563405412. The cubic root of 20472515 is about 273.5628162351.

Adding to 20472515 its reverse (51527402), we get a palindrome (71999917).

The spelling of 20472515 in words is "twenty million, four hundred seventy-two thousand, five hundred fifteen".