20253634 has 8 divisors (see below), whose sum is σ = 30436668. Its totient is φ = 10108080.

The previous prime is 20253589. The next prime is 20253661. The reversal of 20253634 is 43635202.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 20223009 + 30625 = 4497^2 + 175^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 20253599 and 20253608.

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 3 ways as a sum of consecutive naturals, for example, 7977 + ... + 10204.

Almost surely, 2^20253634 is an apocalyptic number.

20253634 is a deficient number, since it is larger than the sum of its proper divisors (10183034).

20253634 is a wasteful number, since it uses less digits than its factorization.

20253634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18740.

The product of its (nonzero) digits is 4320, while the sum is 25.

The square root of 20253634 is about 4500.4037596642. The cubic root of 20253634 is about 272.5843926810.

Adding to 20253634 its reverse (43635202), we get a palindrome (63888836).

The spelling of 20253634 in words is "twenty million, two hundred fifty-three thousand, six hundred thirty-four".