20523012015 has 32 divisors (see below), whose sum is σ = 36253598976. Its totient is φ = 9830658560.

The previous prime is 20523011989. The next prime is 20523012043. The reversal of 20523012015 is 51021032502.

It is not a de Polignac number, because 20523012015 - 2⁸ = 20523011759 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20523011982 and 20523012000.

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 31 ways as a sum of consecutive naturals, for example, 735594 + ... + 762983.

It is an arithmetic number, because the mean of its divisors is an integer number (1132924968).

Almost surely, 2^20523012015 is an apocalyptic number.

20523012015 is a deficient number, since it is larger than the sum of its proper divisors (15730586961).

20523012015 is a wasteful number, since it uses less digits than its factorization.

20523012015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1498679.

The product of its (nonzero) digits is 600, while the sum is 21.

Adding to 20523012015 its reverse (51021032502), we get a palindrome (71544044517).

The spelling of 20523012015 in words is "twenty billion, five hundred twenty-three million, twelve thousand, fifteen".