20988468 has 18 divisors (see below), whose sum is σ = 53054274. Its totient is φ = 6996144.

The previous prime is 20988467. The next prime is 20988481. The reversal of 20988468 is 86488902.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 17791524 + 3196944 = 4218^2 + 1788^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20988467) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 291471 + ... + 291542.

Almost surely, 2^20988468 is an apocalyptic number.

It is an amenable number.

20988468 is an abundant number, since it is smaller than the sum of its proper divisors (32065806).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20988468 is a wasteful number, since it uses less digits than its factorization.

20988468 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 583023 (or 583018 counting only the distinct ones).

The product of its (nonzero) digits is 221184, while the sum is 45.

The square root of 20988468 is about 4581.3172778143. The cubic root of 20988468 is about 275.8419069410.

The spelling of 20988468 in words is "twenty million, nine hundred eighty-eight thousand, four hundred sixty-eight".