20503502606 has 16 divisors (see below), whose sum is σ = 31670962224. Its totient is φ = 9949552704.

The previous prime is 20503502581. The next prime is 20503502629. The reversal of 20503502606 is 60620530502.

It is a happy number.

It is a super-2 number, since 2×20503502606² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 745775 + ... + 772778.

It is an arithmetic number, because the mean of its divisors is an integer number (1979435139).

Almost surely, 2^20503502606 is an apocalyptic number.

20503502606 is a deficient number, since it is larger than the sum of its proper divisors (11167459618).

20503502606 is a wasteful number, since it uses less digits than its factorization.

20503502606 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1518755.

The product of its (nonzero) digits is 10800, while the sum is 29.

The spelling of 20503502606 in words is "twenty billion, five hundred three million, five hundred two thousand, six hundred six".