20403552 has 48 divisors (see below), whose sum is σ = 57682800. Its totient is φ = 6277632.

The previous prime is 20403541. The next prime is 20403589. The reversal of 20403552 is 25530402.

It is a tau number, because it is divible by the number of its divisors (48).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6927 + ... + 9422.

It is an arithmetic number, because the mean of its divisors is an integer number (1201725).

Almost surely, 2^20403552 is an apocalyptic number.

It is an amenable number.

20403552 is an abundant number, since it is smaller than the sum of its proper divisors (37279248).

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

20403552 is a wasteful number, since it uses less digits than its factorization.

20403552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16375 (or 16367 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 21.

The square root of 20403552 is about 4517.0291121488. The cubic root of 20403552 is about 273.2552992920.

Adding to 20403552 its reverse (25530402), we get a palindrome (45933954).

The spelling of 20403552 in words is "twenty million, four hundred three thousand, five hundred fifty-two".