20202018638 has 16 divisors (see below), whose sum is σ = 30704773680. Its totient is φ = 9967875456.

The previous prime is 20202018637. The next prime is 20202018649. The reversal of 20202018638 is 83681020202.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20202018631) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 143420 + ... + 246927.

It is an arithmetic number, because the mean of its divisors is an integer number (1919048355).

Almost surely, 2^20202018638 is an apocalyptic number.

20202018638 is a deficient number, since it is larger than the sum of its proper divisors (10502755042).

20202018638 is a wasteful number, since it uses less digits than its factorization.

20202018638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 390691.

The product of its (nonzero) digits is 9216, while the sum is 32.

The spelling of 20202018638 in words is "twenty billion, two hundred two million, eighteen thousand, six hundred thirty-eight".