20503245502413 has 6 divisors (see below), whose sum is σ = 29615799059054. Its totient is φ = 13668830334936.

The previous prime is 20503245502409. The next prime is 20503245502447. The reversal of 20503245502413 is 31420554230502.

20503245502413 is a `hidden beast` number, since 2 + 0 + 50 + 3 + 24 + 550 + 24 + 13 = 666.

It can be written as a sum of positive squares in only one way, i.e., 14920435839204 + 5582809663209 = 3862698^2 + 2362797^2 .

It is not a de Polignac number, because 20503245502413 - 2² = 20503245502409 is a prime.

It is a super-2 number, since 2×20503245502413² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20503245502613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1139069194570 + ... + 1139069194587.

Almost surely, 2^{20503245502413} is an apocalyptic number.

It is an amenable number.

20503245502413 is a deficient number, since it is larger than the sum of its proper divisors (9112553556641).

20503245502413 is a wasteful number, since it uses less digits than its factorization.

20503245502413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2278138389163 (or 2278138389160 counting only the distinct ones).

The product of its (nonzero) digits is 144000, while the sum is 36.

Adding to 20503245502413 its reverse (31420554230502), we get a palindrome (51923799732915).

The spelling of 20503245502413 in words is "twenty trillion, five hundred three billion, two hundred forty-five million, five hundred two thousand, four hundred thirteen".