20547992 has 8 divisors (see below), whose sum is σ = 38527500. Its totient is φ = 10273992.

The previous prime is 20547983. The next prime is 20547997. The reversal of 20547992 is 29974502.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20547997) 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 as a sum of consecutive naturals, namely, 1284242 + ... + 1284257.

Almost surely, 2^20547992 is an apocalyptic number.

It is an amenable number.

20547992 is a deficient number, since it is larger than the sum of its proper divisors (17979508).

20547992 is a wasteful number, since it uses less digits than its factorization.

20547992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2568505 (or 2568501 counting only the distinct ones).

The product of its (nonzero) digits is 45360, while the sum is 38.

The square root of 20547992 is about 4532.9893006712. The cubic root of 20547992 is about 273.8985896405.

The spelling of 20547992 in words is "twenty million, five hundred forty-seven thousand, nine hundred ninety-two".