20253616 has 40 divisors (see below), whose sum is σ = 41854464. Its totient is φ = 9472320.

The previous prime is 20253589. The next prime is 20253661. The reversal of 20253616 is 61635202.

It is a super-2 number, since 2×20253616² = 820417922150912, which contains 22 as substring.

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 7 ways as a sum of consecutive naturals, for example, 16711 + ... + 17881.

Almost surely, 2^20253616 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20253616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20927232).

20253616 is an abundant number, since it is smaller than the sum of its proper divisors (21600848).

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

20253616 is a wasteful number, since it uses less digits than its factorization.

20253616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1249 (or 1243 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 20253616 is about 4500.4017598432. The cubic root of 20253616 is about 272.5843119298.

Adding to 20253616 its reverse (61635202), we get a palindrome (81888818).

The spelling of 20253616 in words is "twenty million, two hundred fifty-three thousand, six hundred sixteen".