20988104 has 16 divisors (see below), whose sum is σ = 39736320. Its totient is φ = 10391760.

The previous prime is 20988101. The next prime is 20988109. The reversal of 20988104 is 40188902.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (20988101) 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, 11912 + ... + 13559.

It is an arithmetic number, because the mean of its divisors is an integer number (2483520).

Almost surely, 2^20988104 is an apocalyptic number.

It is an amenable number.

20988104 is a deficient number, since it is larger than the sum of its proper divisors (18748216).

20988104 is a wasteful number, since it uses less digits than its factorization.

20988104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25580 (or 25576 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 32.

The square root of 20988104 is about 4581.2775510768. The cubic root of 20988104 is about 275.8403123028.

The spelling of 20988104 in words is "twenty million, nine hundred eighty-eight thousand, one hundred four".