20951207 has 4 divisors (see below), whose sum is σ = 20962656. Its totient is φ = 20939760.

The previous prime is 20951201. The next prime is 20951209. The reversal of 20951207 is 70215902.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20951207 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 (20951201) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2294 + ... + 6867.

It is an arithmetic number, because the mean of its divisors is an integer number (5240664).

Almost surely, 2^20951207 is an apocalyptic number.

20951207 is a deficient number, since it is larger than the sum of its proper divisors (11449).

20951207 is an equidigital number, since it uses as much as digits as its factorization.

20951207 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11448.

The product of its (nonzero) digits is 1260, while the sum is 26.

The square root of 20951207 is about 4577.2488461957. The cubic root of 20951207 is about 275.6785754456.

The spelling of 20951207 in words is "twenty million, nine hundred fifty-one thousand, two hundred seven".