20942140 has 12 divisors (see below), whose sum is σ = 43978536. Its totient is φ = 8376848.

The previous prime is 20942101. The next prime is 20942149. The reversal of 20942140 is 4124902.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20942149) 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, 523534 + ... + 523573.

It is an arithmetic number, because the mean of its divisors is an integer number (3664878).

Almost surely, 2^20942140 is an apocalyptic number.

20942140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20942140 is an abundant number, since it is smaller than the sum of its proper divisors (23036396).

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

20942140 is a wasteful number, since it uses less digits than its factorization.

20942140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1047116 (or 1047114 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 20942140 is about 4576.2582969059. The cubic root of 20942140 is about 275.6388014712.

The spelling of 20942140 in words is "twenty million, nine hundred forty-two thousand, one hundred forty".