20553242 has 4 divisors (see below), whose sum is σ = 30829866. Its totient is φ = 10276620.

The previous prime is 20553227. The next prime is 20553251. The reversal of 20553242 is 24235502.

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., 12538681 + 8014561 = 3541^2 + 2831^2 .

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, 5138309 + ... + 5138312.

Almost surely, 2^20553242 is an apocalyptic number.

20553242 is a deficient number, since it is larger than the sum of its proper divisors (10276624).

20553242 is a wasteful number, since it uses less digits than its factorization.

20553242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10276623.

The product of its (nonzero) digits is 2400, while the sum is 23.

The square root of 20553242 is about 4533.5683517512. The cubic root of 20553242 is about 273.9219146308.

Adding to 20553242 its reverse (24235502), we get a palindrome (44788744).

The spelling of 20553242 in words is "twenty million, five hundred fifty-three thousand, two hundred forty-two".