20523942 has 20 divisors (see below), whose sum is σ = 45989196. Its totient is φ = 6841260.

The previous prime is 20523941. The next prime is 20523949. The reversal of 20523942 is 24932502.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20523941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 63184 + ... + 63507.

Almost surely, 2^20523942 is an apocalyptic number.

20523942 is an abundant number, since it is smaller than the sum of its proper divisors (25465254).

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

20523942 is a wasteful number, since it uses less digits than its factorization.

20523942 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126705 (or 126696 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 20523942 is about 4530.3357491471. The cubic root of 20523942 is about 273.7916881530.

The spelling of 20523942 in words is "twenty million, five hundred twenty-three thousand, nine hundred forty-two".