20725507 has 8 divisors (see below), whose sum is σ = 23592960. Its totient is φ = 18021960.

The previous prime is 20725501. The next prime is 20725547. The reversal of 20725507 is 70552702.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-20725507 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20725501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40707 + ... + 41212.

It is an arithmetic number, because the mean of its divisors is an integer number (2949120).

Almost surely, 2^20725507 is an apocalyptic number.

20725507 is a deficient number, since it is larger than the sum of its proper divisors (2867453).

20725507 is a wasteful number, since it uses less digits than its factorization.

20725507 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81953.

The product of its (nonzero) digits is 4900, while the sum is 28.

The square root of 20725507 is about 4552.5275397300. The cubic root of 20725507 is about 274.6850697824.

It can be divided in two parts, 20 and 725507, that added together give a palindrome (725527).

The spelling of 20725507 in words is "twenty million, seven hundred twenty-five thousand, five hundred seven".