20542724 has 12 divisors (see below), whose sum is σ = 37842000. Its totient is φ = 9730728.

The previous prime is 20542673. The next prime is 20542729. The reversal of 20542724 is 42724502.

It is a junction number, because it is equal to n+sod(n) for n = 20542693 and 20542702.

It is not an unprimeable number, because it can be changed into a prime (20542729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 135074 + ... + 135225.

It is an arithmetic number, because the mean of its divisors is an integer number (3153500).

Almost surely, 2^20542724 is an apocalyptic number.

It is an amenable number.

20542724 is a deficient number, since it is larger than the sum of its proper divisors (17299276).

20542724 is a wasteful number, since it uses less digits than its factorization.

20542724 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 270322 (or 270320 counting only the distinct ones).

The product of its (nonzero) digits is 4480, while the sum is 26.

The square root of 20542724 is about 4532.4081899141. The cubic root of 20542724 is about 273.8751806849.

The spelling of 20542724 in words is "twenty million, five hundred forty-two thousand, seven hundred twenty-four".