20725329 has 16 divisors (see below), whose sum is σ = 30205440. Its totient is φ = 12583680.

The previous prime is 20725307. The next prime is 20725337. The reversal of 20725329 is 92352702.

It is a happy number.

It is not a de Polignac number, because 20725329 - 2⁵ = 20725297 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20725296 and 20725305.

It is not an unprimeable number, because it can be changed into a prime (20725339) 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 15 ways as a sum of consecutive naturals, for example, 4974 + ... + 8135.

It is an arithmetic number, because the mean of its divisors is an integer number (1887840).

Almost surely, 2^20725329 is an apocalyptic number.

It is an amenable number.

20725329 is a deficient number, since it is larger than the sum of its proper divisors (9480111).

20725329 is a wasteful number, since it uses less digits than its factorization.

20725329 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13160.

The product of its (nonzero) digits is 7560, while the sum is 30.

The square root of 20725329 is about 4552.5079901083. The cubic root of 20725329 is about 274.6842834070.

The spelling of 20725329 in words is "twenty million, seven hundred twenty-five thousand, three hundred twenty-nine".