20748438 has 36 divisors (see below), whose sum is σ = 47016060. Its totient is φ = 6612408.

The previous prime is 20748421. The next prime is 20748443. The reversal of 20748438 is 83484702.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 8433 + ... + 10611.

Almost surely, 2^20748438 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20748438, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23508030).

20748438 is an abundant number, since it is smaller than the sum of its proper divisors (26267622).

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

20748438 is a wasteful number, since it uses less digits than its factorization.

20748438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2233 (or 2207 counting only the distinct ones).

The product of its (nonzero) digits is 43008, while the sum is 36.

The square root of 20748438 is about 4555.0453345713. The cubic root of 20748438 is about 274.7863376184.

The spelling of 20748438 in words is "twenty million, seven hundred forty-eight thousand, four hundred thirty-eight".