20953907 has 8 divisors (see below), whose sum is σ = 22621536. Its totient is φ = 19294272.

The previous prime is 20953901. The next prime is 20953939. The reversal of 20953907 is 70935902.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20953907 - 2²⁴ = 4176691 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20953901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4178 + ... + 7704.

It is an arithmetic number, because the mean of its divisors is an integer number (2827692).

Almost surely, 2^20953907 is an apocalyptic number.

20953907 is a deficient number, since it is larger than the sum of its proper divisors (1667629).

20953907 is a wasteful number, since it uses less digits than its factorization.

20953907 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3997.

The product of its (nonzero) digits is 17010, while the sum is 35.

The square root of 20953907 is about 4577.5437736847. The cubic root of 20953907 is about 275.6904172483.

The spelling of 20953907 in words is "twenty million, nine hundred fifty-three thousand, nine hundred seven".