20126500646 has 16 divisors (see below), whose sum is σ = 35236670976. Its totient is φ = 8442118536.

The previous prime is 20126500591. The next prime is 20126500661. The reversal of 20126500646 is 64600562102.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15293036 + ... + 15294351.

It is an arithmetic number, because the mean of its divisors is an integer number (2202291936).

Almost surely, 2^20126500646 is an apocalyptic number.

20126500646 is a deficient number, since it is larger than the sum of its proper divisors (15110170330).

20126500646 is a wasteful number, since it uses less digits than its factorization.

20126500646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30587443.

The product of its (nonzero) digits is 17280, while the sum is 32.

The spelling of 20126500646 in words is "twenty billion, one hundred twenty-six million, five hundred thousand, six hundred forty-six".