20923611 has 16 divisors (see below), whose sum is σ = 28804608. Its totient is φ = 13500000.

The previous prime is 20923607. The next prime is 20923621. The reversal of 20923611 is 11632902.

It is not a de Polignac number, because 20923611 - 2² = 20923607 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20923621) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27486 + ... + 28236.

It is an arithmetic number, because the mean of its divisors is an integer number (1800288).

Almost surely, 2^20923611 is an apocalyptic number.

20923611 is a deficient number, since it is larger than the sum of its proper divisors (7880997).

20923611 is a wasteful number, since it uses less digits than its factorization.

20923611 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1042.

The product of its (nonzero) digits is 648, while the sum is 24.

The square root of 20923611 is about 4574.2333783925. The cubic root of 20923611 is about 275.5574850703.

The spelling of 20923611 in words is "twenty million, nine hundred twenty-three thousand, six hundred eleven".