20918206004 has 12 divisors (see below), whose sum is σ = 36607938528. Its totient is φ = 10458795000.

The previous prime is 20918205989. The next prime is 20918206033. The reversal of 20918206004 is 40060281902.

It is a hoax number, since the sum of its digits (32) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 150479 + ... + 253929.

It is an arithmetic number, because the mean of its divisors is an integer number (3050661544).

Almost surely, 2^20918206004 is an apocalyptic number.

It is an amenable number.

20918206004 is a deficient number, since it is larger than the sum of its proper divisors (15689732524).

20918206004 is a wasteful number, since it uses less digits than its factorization.

20918206004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154006 (or 154004 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 32.

Adding to 20918206004 its reverse (40060281902), we get a palindrome (60978487906).

The spelling of 20918206004 in words is "twenty billion, nine hundred eighteen million, two hundred six thousand, four".