20725522 has 4 divisors (see below), whose sum is σ = 31088286. Its totient is φ = 10362760.

The previous prime is 20725501. The next prime is 20725547. The reversal of 20725522 is 22552702.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 22552702 = 2 ⋅11276351.

It can be written as a sum of positive squares in only one way, i.e., 18740241 + 1985281 = 4329^2 + 1409^2 .

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, 5181379 + ... + 5181382.

Almost surely, 2^20725522 is an apocalyptic number.

20725522 is a deficient number, since it is larger than the sum of its proper divisors (10362764).

20725522 is a wasteful number, since it uses less digits than its factorization.

20725522 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10362763.

The product of its (nonzero) digits is 2800, while the sum is 25.

The square root of 20725522 is about 4552.5291871662. The cubic root of 20725522 is about 274.6851360497.

The spelling of 20725522 in words is "twenty million, seven hundred twenty-five thousand, five hundred twenty-two".