20253440015 has 4 divisors (see below), whose sum is σ = 24304128024. Its totient is φ = 16202752008.

The previous prime is 20253440003. The next prime is 20253440033. The reversal of 20253440015 is 51004435202.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20253440015 - 2⁶ = 20253439951 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2025343997 + ... + 2025344006.

It is an arithmetic number, because the mean of its divisors is an integer number (6076032006).

Almost surely, 2^20253440015 is an apocalyptic number.

20253440015 is a deficient number, since it is larger than the sum of its proper divisors (4050688009).

20253440015 is an equidigital number, since it uses as much as digits as its factorization.

20253440015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4050688008.

The product of its (nonzero) digits is 4800, while the sum is 26.

Adding to 20253440015 its reverse (51004435202), we get a palindrome (71257875217).

The spelling of 20253440015 in words is "twenty billion, two hundred fifty-three million, four hundred forty thousand, fifteen".