20942724 has 24 divisors (see below), whose sum is σ = 53309088. Its totient is φ = 6346240.

The previous prime is 20942723. The next prime is 20942741. The reversal of 20942724 is 42724902.

It is a junction number, because it is equal to n+sod(n) for n = 20942691 and 20942700.

It is not an unprimeable number, because it can be changed into a prime (20942723) 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, 79197 + ... + 79460.

It is an arithmetic number, because the mean of its divisors is an integer number (2221212).

Almost surely, 2^20942724 is an apocalyptic number.

It is an amenable number.

20942724 is an abundant number, since it is smaller than the sum of its proper divisors (32366364).

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

20942724 is a wasteful number, since it uses less digits than its factorization.

20942724 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158675 (or 158673 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 30.

The square root of 20942724 is about 4576.3221040482. The cubic root of 20942724 is about 275.6413636348.

The spelling of 20942724 in words is "twenty million, nine hundred forty-two thousand, seven hundred twenty-four".