20552240 has 20 divisors (see below), whose sum is σ = 47784144. Its totient is φ = 8220864.

The previous prime is 20552177. The next prime is 20552249. The reversal of 20552240 is 4225502.

It is a tau number, because it is divible by the number of its divisors (20).

It is a Harshad number since it is a multiple of its sum of digits (20).

It is not an unprimeable number, because it can be changed into a prime (20552249) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 128372 + ... + 128531.

Almost surely, 2^20552240 is an apocalyptic number.

20552240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20552240 is an abundant number, since it is smaller than the sum of its proper divisors (27231904).

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

20552240 is a wasteful number, since it uses less digits than its factorization.

20552240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 256916 (or 256910 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 20.

The square root of 20552240 is about 4533.4578414274. The cubic root of 20552240 is about 273.9174631965.

Adding to 20552240 its reverse (4225502), we get a palindrome (24777742).

The spelling of 20552240 in words is "twenty million, five hundred fifty-two thousand, two hundred forty".