20402003 has 4 divisors (see below), whose sum is σ = 20548920. Its totient is φ = 20255088.

The previous prime is 20401973. The next prime is 20402009. The reversal of 20402003 is 30020402.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20402003 - 2¹⁴ = 20385619 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20402009) 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, 73250 + ... + 73527.

It is an arithmetic number, because the mean of its divisors is an integer number (5137230).

Almost surely, 2^20402003 is an apocalyptic number.

20402003 is a deficient number, since it is larger than the sum of its proper divisors (146917).

20402003 is a wasteful number, since it uses less digits than its factorization.

20402003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146916.

The product of its (nonzero) digits is 48, while the sum is 11.

The square root of 20402003 is about 4516.8576466389. The cubic root of 20402003 is about 273.2483841044.

Adding to 20402003 its reverse (30020402), we get a palindrome (50422405).

The spelling of 20402003 in words is "twenty million, four hundred two thousand, three".