20023693993 has 4 divisors (see below), whose sum is σ = 20894289408. Its totient is φ = 19153098580.

The previous prime is 20023693957. The next prime is 20023693997. The reversal of 20023693993 is 39939632002.

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, and also an emirpimes, since its reverse is a distinct semiprime: 39939632002 = 2 ⋅19969816001.

It is a cyclic number.

It is not a de Polignac number, because 20023693993 - 2¹⁷ = 20023562921 is a prime.

It is a super-2 number, since 2×20023693993² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20023693997) 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, 435297673 + ... + 435297718.

It is an arithmetic number, because the mean of its divisors is an integer number (5223572352).

Almost surely, 2^20023693993 is an apocalyptic number.

20023693993 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

20023693993 is a deficient number, since it is larger than the sum of its proper divisors (870595415).

20023693993 is an equidigital number, since it uses as much as digits as its factorization.

20023693993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 870595414.

The product of its (nonzero) digits is 472392, while the sum is 46.

The spelling of 20023693993 in words is "twenty billion, twenty-three million, six hundred ninety-three thousand, nine hundred ninety-three".