20988436 has 12 divisors (see below), whose sum is σ = 41976928. Its totient is φ = 8995032.

The previous prime is 20988403. The next prime is 20988437. The reversal of 20988436 is 63488902.

20988436 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20988437) 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, 374766 + ... + 374821.

Almost surely, 2^20988436 is an apocalyptic number.

It is an amenable number.

20988436 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

20988436 is a wasteful number, since it uses less digits than its factorization.

20988436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 749598 (or 749596 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 40.

The square root of 20988436 is about 4581.3137853677. The cubic root of 20988436 is about 275.8417667537.

The spelling of 20988436 in words is "twenty million, nine hundred eighty-eight thousand, four hundred thirty-six".