20873951 has 16 divisors (see below), whose sum is σ = 25632000. Its totient is φ = 16944984.

The previous prime is 20873899. The next prime is 20873953. The reversal of 20873951 is 15937802.

It is not a de Polignac number, because 20873951 - 2⁶ = 20873887 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20873953) 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, 4916 + ... + 8118.

It is an arithmetic number, because the mean of its divisors is an integer number (1602000).

Almost surely, 2^20873951 is an apocalyptic number.

20873951 is a deficient number, since it is larger than the sum of its proper divisors (4758049).

20873951 is an equidigital number, since it uses as much as digits as its factorization.

20873951 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3243 (or 3229 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 35.

The square root of 20873951 is about 4568.8019217296. The cubic root of 20873951 is about 275.3393100940.

The spelling of 20873951 in words is "twenty million, eight hundred seventy-three thousand, nine hundred fifty-one".