20953744 has 40 divisors (see below), whose sum is σ = 47173568. Its totient is φ = 8830080.

The previous prime is 20953717. The next prime is 20953811. The reversal of 20953744 is 44735902.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5299 + ... + 8365.

Almost surely, 2^20953744 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 20953744, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23586784).

20953744 is an abundant number, since it is smaller than the sum of its proper divisors (26219824).

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

20953744 is a wasteful number, since it uses less digits than its factorization.

20953744 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3143 (or 3137 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 34.

The square root of 20953744 is about 4577.5259693420. The cubic root of 20953744 is about 275.6897023832.

The spelling of 20953744 in words is "twenty million, nine hundred fifty-three thousand, seven hundred forty-four".