20953699223 has 4 divisors (see below), whose sum is σ = 21864729648. Its totient is φ = 20042668800.

The previous prime is 20953699183. The next prime is 20953699241. The reversal of 20953699223 is 32299635902.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32299635902 = 2 ⋅16149817951.

It is a cyclic number.

It is not a de Polignac number, because 20953699223 - 2⁸ = 20953698967 is a prime.

It is a super-2 number, since 2×20953699223² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20953693223) 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, 455515178 + ... + 455515223.

It is an arithmetic number, because the mean of its divisors is an integer number (5466182412).

Almost surely, 2^20953699223 is an apocalyptic number.

20953699223 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

20953699223 is a deficient number, since it is larger than the sum of its proper divisors (911030425).

20953699223 is an equidigital number, since it uses as much as digits as its factorization.

20953699223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 911030424.

The product of its (nonzero) digits is 1574640, while the sum is 50.

The spelling of 20953699223 in words is "twenty billion, nine hundred fifty-three million, six hundred ninety-nine thousand, two hundred twenty-three".