20073929 has 4 divisors (see below), whose sum is σ = 20083140. Its totient is φ = 20064720.

The previous prime is 20073919. The next prime is 20073931. The reversal of 20073929 is 92937002.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 92937002 = 2 ⋅46468501.

It can be written as a sum of positive squares in 2 ways, for example, as 6553600 + 13520329 = 2560^2 + 3677^2 .

It is a cyclic number.

It is not a de Polignac number, because 20073929 - 2⁸ = 20073673 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20073895 and 20073904.

It is not an unprimeable number, because it can be changed into a prime (20073919) 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, 707 + ... + 6375.

It is an arithmetic number, because the mean of its divisors is an integer number (5020785).

Almost surely, 2^20073929 is an apocalyptic number.

It is an amenable number.

20073929 is a deficient number, since it is larger than the sum of its proper divisors (9211).

20073929 is an equidigital number, since it uses as much as digits as its factorization.

20073929 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9210.

The product of its (nonzero) digits is 6804, while the sum is 32.

The square root of 20073929 is about 4480.3938442954. The cubic root of 20073929 is about 271.7758073692.

The spelling of 20073929 in words is "twenty million, seventy-three thousand, nine hundred twenty-nine".