20900929 has 4 divisors (see below), whose sum is σ = 23886784. Its totient is φ = 17915076.

The previous prime is 20900923. The next prime is 20900933. The reversal of 20900929 is 92900902.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20900929 - 2⁵ = 20900897 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20900929.

It is not an unprimeable number, because it can be changed into a prime (20900923) by changing a digit.

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, 1492917 + ... + 1492930.

It is an arithmetic number, because the mean of its divisors is an integer number (5971696).

Almost surely, 2^20900929 is an apocalyptic number.

It is an amenable number.

20900929 is a deficient number, since it is larger than the sum of its proper divisors (2985855).

20900929 is an equidigital number, since it uses as much as digits as its factorization.

20900929 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2985854.

The product of its (nonzero) digits is 2916, while the sum is 31.

The square root of 20900929 is about 4571.7533835499. The cubic root of 20900929 is about 275.4578774273.

The spelling of 20900929 in words is "twenty million, nine hundred thousand, nine hundred twenty-nine".