20953793 has 4 divisors (see below), whose sum is σ = 23947200. Its totient is φ = 17960388.

The previous prime is 20953717. The next prime is 20953811. The reversal of 20953793 is 39735902.

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 20953793 - 2¹² = 20949697 is a prime.

It is a super-2 number, since 2×20953793² = 878122882173698, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20953693) 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, 1496693 + ... + 1496706.

It is an arithmetic number, because the mean of its divisors is an integer number (5986800).

Almost surely, 2^20953793 is an apocalyptic number.

It is an amenable number.

20953793 is a deficient number, since it is larger than the sum of its proper divisors (2993407).

20953793 is an equidigital number, since it uses as much as digits as its factorization.

20953793 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2993406.

The product of its (nonzero) digits is 51030, while the sum is 38.

The square root of 20953793 is about 4577.5313215750. The cubic root of 20953793 is about 275.6899172817.

The spelling of 20953793 in words is "twenty million, nine hundred fifty-three thousand, seven hundred ninety-three".