20725210 has 32 divisors (see below), whose sum is σ = 43094592. Its totient is φ = 7092480.

The previous prime is 20725171. The next prime is 20725241. The reversal of 20725210 is 1252702.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3672 + ... + 7411.

It is an arithmetic number, because the mean of its divisors is an integer number (1346706).

Almost surely, 2^20725210 is an apocalyptic number.

20725210 is an abundant number, since it is smaller than the sum of its proper divisors (22369382).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20725210 is a wasteful number, since it uses less digits than its factorization.

20725210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11118.

The product of its (nonzero) digits is 280, while the sum is 19.

The square root of 20725210 is about 4552.4949203706. The cubic root of 20725210 is about 274.6837576817.

Adding to 20725210 its reverse (1252702), we get a palindrome (21977912).

The spelling of 20725210 in words is "twenty million, seven hundred twenty-five thousand, two hundred ten".