20525642 has 4 divisors (see below), whose sum is σ = 30788466. Its totient is φ = 10262820.

The previous prime is 20525633. The next prime is 20525653. The reversal of 20525642 is 24652502.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 12397441 + 8128201 = 3521^2 + 2851^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5131409 + ... + 5131412.

Almost surely, 2^20525642 is an apocalyptic number.

20525642 is a deficient number, since it is larger than the sum of its proper divisors (10262824).

20525642 is a wasteful number, since it uses less digits than its factorization.

20525642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10262823.

The product of its (nonzero) digits is 4800, while the sum is 26.

The square root of 20525642 is about 4530.5233693250. The cubic root of 20525642 is about 273.7992473411.

The spelling of 20525642 in words is "twenty million, five hundred twenty-five thousand, six hundred forty-two".