20643938195006 has 32 divisors (see below), whose sum is σ = 35415976270080. Its totient is φ = 8840810961216.

The previous prime is 20643938194987. The next prime is 20643938195009. The reversal of 20643938195006 is 60059183934602.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20643938195009) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 407096705 + ... + 407147411.

It is an arithmetic number, because the mean of its divisors is an integer number (1106749258440).

Almost surely, 2^{20643938195006} is an apocalyptic number.

20643938195006 is a deficient number, since it is larger than the sum of its proper divisors (14772038075074).

20643938195006 is a wasteful number, since it uses less digits than its factorization.

20643938195006 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71808.

The product of its (nonzero) digits is 8398080, while the sum is 56.

The spelling of 20643938195006 in words is "twenty trillion, six hundred forty-three billion, nine hundred thirty-eight million, one hundred ninety-five thousand, six".