20505010 has 16 divisors (see below), whose sum is σ = 36963072. Its totient is φ = 8190000.

The previous prime is 20505007. The next prime is 20505031. The reversal of 20505010 is 1050502.

20505010 is nontrivially palindromic in base 9.

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, 9535 + ... + 11485.

It is an arithmetic number, because the mean of its divisors is an integer number (2310192).

Almost surely, 2^20505010 is an apocalyptic number.

20505010 is a deficient number, since it is larger than the sum of its proper divisors (16458062).

20505010 is a wasteful number, since it uses less digits than its factorization.

20505010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3009.

The product of its (nonzero) digits is 50, while the sum is 13.

The square root of 20505010 is about 4528.2457972155. The cubic root of 20505010 is about 273.7074772535.

Adding to 20505010 its reverse (1050502), we get a palindrome (21555512).

The spelling of 20505010 in words is "twenty million, five hundred five thousand, ten".