20725396 has 6 divisors (see below), whose sum is σ = 36269450. Its totient is φ = 10362696.

The previous prime is 20725387. The next prime is 20725403. The reversal of 20725396 is 69352702.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 19236996 + 1488400 = 4386^2 + 1220^2 .

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 2590671 + ... + 2590678.

Almost surely, 2^20725396 is an apocalyptic number.

It is an amenable number.

20725396 is a deficient number, since it is larger than the sum of its proper divisors (15544054).

20725396 is a wasteful number, since it uses less digits than its factorization.

20725396 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5181353 (or 5181351 counting only the distinct ones).

The product of its (nonzero) digits is 22680, while the sum is 34.

The square root of 20725396 is about 4552.5153486836. The cubic root of 20725396 is about 274.6845794028.

The spelling of 20725396 in words is "twenty million, seven hundred twenty-five thousand, three hundred ninety-six".