20927992 has 8 divisors (see below), whose sum is σ = 39240000. Its totient is φ = 10463992.

The previous prime is 20927981. The next prime is 20927993. The reversal of 20927992 is 29972902.

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 (20927993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1307992 + ... + 1308007.

It is an arithmetic number, because the mean of its divisors is an integer number (4905000).

Almost surely, 2^20927992 is an apocalyptic number.

It is an amenable number.

20927992 is a deficient number, since it is larger than the sum of its proper divisors (18312008).

20927992 is a wasteful number, since it uses less digits than its factorization.

20927992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2616005 (or 2616001 counting only the distinct ones).

The product of its (nonzero) digits is 40824, while the sum is 40.

The square root of 20927992 is about 4574.7122313868. The cubic root of 20927992 is about 275.5767158665.

The spelling of 20927992 in words is "twenty million, nine hundred twenty-seven thousand, nine hundred ninety-two".