20706906 has 16 divisors (see below), whose sum is σ = 45178848. Its totient is φ = 6274800.

The previous prime is 20706871. The next prime is 20706929. The reversal of 20706906 is 60960702.

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, 156805 + ... + 156936.

It is an arithmetic number, because the mean of its divisors is an integer number (2823678).

Almost surely, 2^20706906 is an apocalyptic number.

20706906 is an abundant number, since it is smaller than the sum of its proper divisors (24471942).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20706906 is a wasteful number, since it uses less digits than its factorization.

20706906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 313757.

The product of its (nonzero) digits is 4536, while the sum is 30.

The square root of 20706906 is about 4550.4841500658. The cubic root of 20706906 is about 274.6028691990.

It can be divided in two parts, 20706 and 906, that added together give a palindrome (21612).

The spelling of 20706906 in words is "twenty million, seven hundred six thousand, nine hundred six".