20988416 has 20 divisors (see below), whose sum is σ = 41936862. Its totient is φ = 10493952.

The previous prime is 20988403. The next prime is 20988437. The reversal of 20988416 is 61488902.

It can be written as a sum of positive squares in only one way, i.e., 20214016 + 774400 = 4496^2 + 880^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 20988416.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19985 + ... + 21008.

Almost surely, 2^20988416 is an apocalyptic number.

It is an amenable number.

20988416 is a deficient number, since it is larger than the sum of its proper divisors (20948446).

20988416 is an frugal number, since it uses more digits than its factorization.

20988416 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41011 (or 40995 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 38.

The square root of 20988416 is about 4581.3116025872. The cubic root of 20988416 is about 275.8416791366.

The spelling of 20988416 in words is "twenty million, nine hundred eighty-eight thousand, four hundred sixteen".