20004638 has 16 divisors (see below), whose sum is σ = 31325616. Its totient is φ = 9572160.

The previous prime is 20004583. The next prime is 20004667. The reversal of 20004638 is 83640002.

It is a happy number.

It is a super-2 number, since 2×20004638² = 800371083022088, which contains 22 as substring.

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, 2045 + ... + 6647.

It is an arithmetic number, because the mean of its divisors is an integer number (1957851).

Almost surely, 2^20004638 is an apocalyptic number.

20004638 is a deficient number, since it is larger than the sum of its proper divisors (11320978).

20004638 is a wasteful number, since it uses less digits than its factorization.

20004638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4699.

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 20004638 is about 4472.6544691044. The cubic root of 20004638 is about 271.4627424859.

The spelling of 20004638 in words is "twenty million, four thousand, six hundred thirty-eight".