20020406 has 16 divisors (see below), whose sum is σ = 34401024. Its totient is φ = 8560104.

The previous prime is 20020387. The next prime is 20020421. The reversal of 20020406 is 60402002.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5621 + ... + 8463.

It is an arithmetic number, because the mean of its divisors is an integer number (2150064).

Almost surely, 2^20020406 is an apocalyptic number.

20020406 is a deficient number, since it is larger than the sum of its proper divisors (14380618).

20020406 is a wasteful number, since it uses less digits than its factorization.

20020406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3355.

The product of its (nonzero) digits is 96, while the sum is 14.

The square root of 20020406 is about 4474.4168335103. The cubic root of 20020406 is about 271.5340476233.

Adding to 20020406 its reverse (60402002), we get a palindrome (80422408).

The spelling of 20020406 in words is "twenty million, twenty thousand, four hundred six".