20553442 has 72 divisors (see below), whose sum is σ = 41682276. Its totient is φ = 7547904.

The previous prime is 20553433. The next prime is 20553443. The reversal of 20553442 is 24435502.

It can be written as a sum of positive squares in 6 ways, for example, as 6105841 + 14447601 = 2471^2 + 3801^2 .

It is not an unprimeable number, because it can be changed into a prime (20553443) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 281518 + ... + 281590.

Almost surely, 2^20553442 is an apocalyptic number.

20553442 is an abundant number, since it is smaller than the sum of its proper divisors (21128834).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20553442 is a wasteful number, since it uses less digits than its factorization.

20553442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132 (or 112 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 25.

The square root of 20553442 is about 4533.5904093775. The cubic root of 20553442 is about 273.9228031234.

Adding to 20553442 its reverse (24435502), we get a palindrome (44988944).

The spelling of 20553442 in words is "twenty million, five hundred fifty-three thousand, four hundred forty-two".