20942928 has 40 divisors (see below), whose sum is σ = 60115200. Its totient is φ = 6980832.

The previous prime is 20942917. The next prime is 20942951. The reversal of 20942928 is 82924902.

20942928 is a `hidden beast` number, since 209 + 429 + 28 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 20942892 and 20942901.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 23808 + ... + 24671.

It is an arithmetic number, because the mean of its divisors is an integer number (1502880).

Almost surely, 2^20942928 is an apocalyptic number.

It is an amenable number.

20942928 is an abundant number, since it is smaller than the sum of its proper divisors (39172272).

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

20942928 is a wasteful number, since it uses less digits than its factorization.

20942928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48496 (or 48484 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 20942928 is about 4576.3443926348. The cubic root of 20942928 is about 275.6422586259.

The spelling of 20942928 in words is "twenty million, nine hundred forty-two thousand, nine hundred twenty-eight".