20711293 has 4 divisors (see below), whose sum is σ = 21611808. Its totient is φ = 19810780.

The previous prime is 20711281. The next prime is 20711297. The reversal of 20711293 is 39211702.

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 20711293 - 2⁵ = 20711261 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 (20711297) 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, 450223 + ... + 450268.

It is an arithmetic number, because the mean of its divisors is an integer number (5402952).

Almost surely, 2^20711293 is an apocalyptic number.

20711293 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

20711293 is a deficient number, since it is larger than the sum of its proper divisors (900515).

20711293 is an equidigital number, since it uses as much as digits as its factorization.

20711293 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 900514.

The product of its (nonzero) digits is 756, while the sum is 25.

The square root of 20711293 is about 4550.9661611574. The cubic root of 20711293 is about 274.6222604385.

Adding to 20711293 its reverse (39211702), we get a palindrome (59922995).

It can be divided in two parts, 2071 and 1293, that added together give a square (3364 = 58²).

The spelling of 20711293 in words is "twenty million, seven hundred eleven thousand, two hundred ninety-three".