20502135206 has 64 divisors (see below), whose sum is σ = 36603409920. Its totient is φ = 8430428160.

The previous prime is 20502135151. The next prime is 20502135211. The reversal of 20502135206 is 60253120502.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 26660390 + ... + 26661158.

It is an arithmetic number, because the mean of its divisors is an integer number (571928280).

Almost surely, 2^20502135206 is an apocalyptic number.

20502135206 is a deficient number, since it is larger than the sum of its proper divisors (16101274714).

20502135206 is a wasteful number, since it uses less digits than its factorization.

20502135206 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1549.

The product of its (nonzero) digits is 3600, while the sum is 26.

Adding to 20502135206 its reverse (60253120502), we get a palindrome (80755255708).

The spelling of 20502135206 in words is "twenty billion, five hundred two million, one hundred thirty-five thousand, two hundred six".