20841406 has 4 divisors (see below), whose sum is σ = 31262112. Its totient is φ = 10420702.

The previous prime is 20841391. The next prime is 20841409. The reversal of 20841406 is 60414802.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20841409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5210350 + ... + 5210353.

It is an arithmetic number, because the mean of its divisors is an integer number (7815528).

Almost surely, 2^20841406 is an apocalyptic number.

20841406 is a deficient number, since it is larger than the sum of its proper divisors (10420706).

20841406 is a wasteful number, since it uses less digits than its factorization.

20841406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10420705.

The product of its (nonzero) digits is 1536, while the sum is 25.

The square root of 20841406 is about 4565.2388765540. The cubic root of 20841406 is about 275.1961399624.

It can be divided in two parts, 208 and 41406, that added together give a palindrome (41614).

The spelling of 20841406 in words is "twenty million, eight hundred forty-one thousand, four hundred six".