20802638 has 8 divisors (see below), whose sum is σ = 31334160. Its totient is φ = 10357920.

The previous prime is 20802637. The next prime is 20802641. The reversal of 20802638 is 83620802.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 20802638.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20802631) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21098 + ... + 22061.

It is an arithmetic number, because the mean of its divisors is an integer number (3916770).

Almost surely, 2^20802638 is an apocalyptic number.

20802638 is a deficient number, since it is larger than the sum of its proper divisors (10531522).

20802638 is a wasteful number, since it uses less digits than its factorization.

20802638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43402.

The product of its (nonzero) digits is 4608, while the sum is 29.

The square root of 20802638 is about 4560.9909011091. The cubic root of 20802638 is about 275.0253993069.

The spelling of 20802638 in words is "twenty million, eight hundred two thousand, six hundred thirty-eight".