20020403 has 4 divisors (see below), whose sum is σ = 21560448. Its totient is φ = 18480360.

The previous prime is 20020387. The next prime is 20020421. The reversal of 20020403 is 30402002.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 30402002 = 2 ⋅15201001.

It is a cyclic number.

It is not a de Polignac number, because 20020403 - 2⁴ = 20020387 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20020453) 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, 770003 + ... + 770028.

It is an arithmetic number, because the mean of its divisors is an integer number (5390112).

Almost surely, 2^20020403 is an apocalyptic number.

20020403 is a deficient number, since it is larger than the sum of its proper divisors (1540045).

20020403 is a wasteful number, since it uses less digits than its factorization.

20020403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1540044.

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

The square root of 20020403 is about 4474.4164982710. The cubic root of 20020403 is about 271.5340340604.

Adding to 20020403 its reverse (30402002), we get a palindrome (50422405).

The spelling of 20020403 in words is "twenty million, twenty thousand, four hundred three".