20725107 has 16 divisors (see below), whose sum is σ = 30266880. Its totient is φ = 12536352.

The previous prime is 20725051. The next prime is 20725123. The reversal of 20725107 is 70152702.

It is not a de Polignac number, because 20725107 - 2¹⁵ = 20692339 is a prime.

It is a super-2 number, since 2×20725107² = 859060120322898, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20725127) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2203 + ... + 6804.

It is an arithmetic number, because the mean of its divisors is an integer number (1891680).

Almost surely, 2^20725107 is an apocalyptic number.

20725107 is a deficient number, since it is larger than the sum of its proper divisors (9541773).

20725107 is a wasteful number, since it uses less digits than its factorization.

20725107 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9082.

The product of its (nonzero) digits is 980, while the sum is 24.

The square root of 20725107 is about 4552.4836078782. The cubic root of 20725107 is about 274.6833026405.

Adding to 20725107 its reverse (70152702), we get a palindrome (90877809).

The spelling of 20725107 in words is "twenty million, seven hundred twenty-five thousand, one hundred seven".