20405006 has 16 divisors (see below), whose sum is σ = 31712640. Its totient is φ = 9836640.

The previous prime is 20404999. The next prime is 20405027. The reversal of 20405006 is 60050402.

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, 24200 + ... + 25028.

It is an arithmetic number, because the mean of its divisors is an integer number (1982040).

Almost surely, 2^20405006 is an apocalyptic number.

20405006 is a deficient number, since it is larger than the sum of its proper divisors (11307634).

20405006 is a wasteful number, since it uses less digits than its factorization.

20405006 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1259.

The product of its (nonzero) digits is 240, while the sum is 17.

The square root of 20405006 is about 4517.1900557758. The cubic root of 20405006 is about 273.2617900535.

Adding to 20405006 its reverse (60050402), we get a palindrome (80455408).

The spelling of 20405006 in words is "twenty million, four hundred five thousand, six".