20801744 has 40 divisors (see below), whose sum is σ = 44068608. Its totient is φ = 9469440.

The previous prime is 20801743. The next prime is 20801749. The reversal of 20801744 is 44710802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20801743) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7199 + ... + 9665.

Almost surely, 2^20801744 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 20801744, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22034304).

20801744 is an abundant number, since it is smaller than the sum of its proper divisors (23266864).

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

20801744 is a wasteful number, since it uses less digits than its factorization.

20801744 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2523 (or 2517 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 26.

The square root of 20801744 is about 4560.8928950371. The cubic root of 20801744 is about 275.0214594824.

The spelling of 20801744 in words is "twenty million, eight hundred one thousand, seven hundred forty-four".