20747424 has 24 divisors (see below), whose sum is σ = 54462240. Its totient is φ = 6915776.

The previous prime is 20747423. The next prime is 20747431. The reversal of 20747424 is 42474702.

It is a tau number, because it is divible by the number of its divisors (24).

It is a junction number, because it is equal to n+sod(n) for n = 20747391 and 20747400.

It is not an unprimeable number, because it can be changed into a prime (20747423) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 107964 + ... + 108155.

It is an arithmetic number, because the mean of its divisors is an integer number (2269260).

Almost surely, 2^20747424 is an apocalyptic number.

20747424 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

20747424 is an abundant number, since it is smaller than the sum of its proper divisors (33714816).

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

20747424 is a wasteful number, since it uses less digits than its factorization.

20747424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 216132 (or 216124 counting only the distinct ones).

The product of its (nonzero) digits is 12544, while the sum is 30.

The square root of 20747424 is about 4554.9340280623. The cubic root of 20747424 is about 274.7818611708.

The spelling of 20747424 in words is "twenty million, seven hundred forty-seven thousand, four hundred twenty-four".