20252740 has 12 divisors (see below), whose sum is σ = 42530796. Its totient is φ = 8101088.

The previous prime is 20252737. The next prime is 20252761. The reversal of 20252740 is 4725202.

It can be written as a sum of positive squares in 2 ways, for example, as 7918596 + 12334144 = 2814^2 + 3512^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 506299 + ... + 506338.

It is an arithmetic number, because the mean of its divisors is an integer number (3544233).

Almost surely, 2^20252740 is an apocalyptic number.

20252740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20252740 is an abundant number, since it is smaller than the sum of its proper divisors (22278056).

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

20252740 is a wasteful number, since it uses less digits than its factorization.

20252740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1012646 (or 1012644 counting only the distinct ones).

The product of its (nonzero) digits is 1120, while the sum is 22.

The square root of 20252740 is about 4500.3044341467. The cubic root of 20252740 is about 272.5803819764.

Adding to 20252740 its reverse (4725202), we get a palindrome (24977942).

The spelling of 20252740 in words is "twenty million, two hundred fifty-two thousand, seven hundred forty".