20942120 has 16 divisors (see below), whose sum is σ = 47119860. Its totient is φ = 8376832.

The previous prime is 20942101. The next prime is 20942149. The reversal of 20942120 is 2124902.

It can be written as a sum of positive squares in 2 ways, for example, as 20016676 + 925444 = 4474^2 + 962^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 20942092 and 20942101.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 261737 + ... + 261816.

Almost surely, 2^20942120 is an apocalyptic number.

20942120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20942120 is an abundant number, since it is smaller than the sum of its proper divisors (26177740).

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

20942120 is a wasteful number, since it uses less digits than its factorization.

20942120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 523564 (or 523560 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 20942120 is about 4576.2561117140. The cubic root of 20942120 is about 275.6387137251.

The spelling of 20942120 in words is "twenty million, nine hundred forty-two thousand, one hundred twenty".