20501164 has 12 divisors (see below), whose sum is σ = 35910000. Its totient is φ = 10241168.

The previous prime is 20501141. The next prime is 20501183. The reversal of 20501164 is 46110502.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5337 + ... + 8335.

It is an arithmetic number, because the mean of its divisors is an integer number (2992500).

Almost surely, 2^20501164 is an apocalyptic number.

It is an amenable number.

20501164 is a deficient number, since it is larger than the sum of its proper divisors (15408836).

20501164 is a wasteful number, since it uses less digits than its factorization.

20501164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4712 (or 4710 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 20501164 is about 4527.8211095404. The cubic root of 20501164 is about 273.6903636346.

Adding to 20501164 its reverse (46110502), we get a palindrome (66611666).

The spelling of 20501164 in words is "twenty million, five hundred one thousand, one hundred sixty-four".