20739825 has 18 divisors (see below), whose sum is σ = 37147734. Its totient is φ = 11061120.

The previous prime is 20739799. The next prime is 20739839. The reversal of 20739825 is 52893702.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 28224 + 20711601 = 168^2 + 4551^2 .

It is not a de Polignac number, because 20739825 - 2⁵ = 20739793 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20739825.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 45864 + ... + 46313.

It is an arithmetic number, because the mean of its divisors is an integer number (2063763).

Almost surely, 2^20739825 is an apocalyptic number.

20739825 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20739825 is a deficient number, since it is larger than the sum of its proper divisors (16407909).

20739825 is a wasteful number, since it uses less digits than its factorization.

20739825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92193 (or 92185 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 36.

The square root of 20739825 is about 4554.0998012780. The cubic root of 20739825 is about 274.7483096587.

The spelling of 20739825 in words is "twenty million, seven hundred thirty-nine thousand, eight hundred twenty-five".