20749968 has 60 divisors (see below), whose sum is σ = 58676800. Its totient is φ = 6844608.

The previous prime is 20749961. The next prime is 20749969. The reversal of 20749968 is 86994702.

It is a happy number.

It is a super-2 number, since 2×20749968² = 861122344002048, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20749961) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14133 + ... + 15531.

Almost surely, 2^20749968 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20749968, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29338400).

20749968 is an abundant number, since it is smaller than the sum of its proper divisors (37926832).

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

20749968 is a wasteful number, since it uses less digits than its factorization.

20749968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1516 (or 1507 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 45.

The square root of 20749968 is about 4555.2132771145. The cubic root of 20749968 is about 274.7930917455.

The spelling of 20749968 in words is "twenty million, seven hundred forty-nine thousand, nine hundred sixty-eight".