20003929 has 4 divisors (see below), whose sum is σ = 21822480. Its totient is φ = 18185380.

The previous prime is 20003927. The next prime is 20003933. The reversal of 20003929 is 92930002.

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 20003929 - 2¹ = 20003927 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20003923) 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, 909259 + ... + 909280.

It is an arithmetic number, because the mean of its divisors is an integer number (5455620).

Almost surely, 2^20003929 is an apocalyptic number.

It is an amenable number.

20003929 is a deficient number, since it is larger than the sum of its proper divisors (1818551).

20003929 is a wasteful number, since it uses less digits than its factorization.

20003929 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1818550.

The product of its (nonzero) digits is 972, while the sum is 25.

The square root of 20003929 is about 4472.5752089820. The cubic root of 20003929 is about 271.4595354070.

It can be divided in two parts, 2000 and 3929, that added together give a square (5929 = 77²).

The spelling of 20003929 in words is "twenty million, three thousand, nine hundred twenty-nine".