20552740 has 48 divisors (see below), whose sum is σ = 46901232. Its totient is φ = 7520256.

The previous prime is 20552717. The next prime is 20552759. The reversal of 20552740 is 4725502.

20552740 = 530² + 531² + ... + 594².

It can be written as a sum of positive squares in 8 ways, for example, as 338724 + 20214016 = 582^2 + 4496^2 .

It is a congruent number.

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 in 15 ways as a sum of consecutive naturals, for example, 35332 + ... + 35908.

It is an arithmetic number, because the mean of its divisors is an integer number (977109).

Almost surely, 2^20552740 is an apocalyptic number.

20552740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20552740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23450616).

20552740 is an abundant number, since it is smaller than the sum of its proper divisors (26348492).

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

20552740 is a wasteful number, since it uses less digits than its factorization.

20552740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 736 (or 734 counting only the distinct ones).

The product of its (nonzero) digits is 2800, while the sum is 25.

The square root of 20552740 is about 4533.5129866363. The cubic root of 20552740 is about 273.9196844892.

The spelling of 20552740 in words is "twenty million, five hundred fifty-two thousand, seven hundred forty".