20756988 has 108 divisors (see below), whose sum is σ = 62717200. Its totient is φ = 5785920.

The previous prime is 20756977. The next prime is 20756993. The reversal of 20756988 is 88965702.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

20756988 is a `hidden beast` number, since 2 + 0 + 7 + 569 + 88 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 506248 + ... + 506288.

Almost surely, 2^20756988 is an apocalyptic number.

20756988 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20756988, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31358600).

20756988 is an abundant number, since it is smaller than the sum of its proper divisors (41960212).

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

20756988 is a wasteful number, since it uses less digits than its factorization.

20756988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113 (or 53 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 45.

The square root of 20756988 is about 4555.9837576532. The cubic root of 20756988 is about 274.8240770142.

The spelling of 20756988 in words is "twenty million, seven hundred fifty-six thousand, nine hundred eighty-eight".