20008620923 has 4 divisors (see below), whose sum is σ = 20112292728. Its totient is φ = 19904949120.

The previous prime is 20008620893. The next prime is 20008620937. The reversal of 20008620923 is 32902680002.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32902680002 = 2 ⋅16451340001.

It is a cyclic number.

It is not a de Polignac number, because 20008620923 - 2²⁸ = 19740185467 is a prime.

It is a super-2 number, since 2×20008620923² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20008620923.

It is not an unprimeable number, because it can be changed into a prime (20008620223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 51835613 + ... + 51835998.

It is an arithmetic number, because the mean of its divisors is an integer number (5028073182).

Almost surely, 2^20008620923 is an apocalyptic number.

20008620923 is a deficient number, since it is larger than the sum of its proper divisors (103671805).

20008620923 is a wasteful number, since it uses less digits than its factorization.

20008620923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103671804.

The product of its (nonzero) digits is 10368, while the sum is 32.

The spelling of 20008620923 in words is "twenty billion, eight million, six hundred twenty thousand, nine hundred twenty-three".