20501144015 has 16 divisors (see below), whose sum is σ = 26932715136. Its totient is φ = 14857226400.

The previous prime is 20501143987. The next prime is 20501144057. The reversal of 20501144015 is 51044110502.

It is not a de Polignac number, because 20501144015 - 2¹⁴ = 20501127631 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 643001 + ... + 674130.

It is an arithmetic number, because the mean of its divisors is an integer number (1683294696).

Almost surely, 2^20501144015 is an apocalyptic number.

20501144015 is a deficient number, since it is larger than the sum of its proper divisors (6431571121).

20501144015 is a wasteful number, since it uses less digits than its factorization.

20501144015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1317430.

The product of its (nonzero) digits is 800, while the sum is 23.

Adding to 20501144015 its reverse (51044110502), we get a palindrome (71545254517).

The spelling of 20501144015 in words is "twenty billion, five hundred one million, one hundred forty-four thousand, fifteen".