20726806 has 4 divisors (see below), whose sum is σ = 31090212. Its totient is φ = 10363402.

The previous prime is 20726803. The next prime is 20726807. The reversal of 20726806 is 60862702.

It is a happy number.

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 (20726801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5181700 + ... + 5181703.

It is an arithmetic number, because the mean of its divisors is an integer number (7772553).

Almost surely, 2^20726806 is an apocalyptic number.

20726806 is a deficient number, since it is larger than the sum of its proper divisors (10363406).

20726806 is a wasteful number, since it uses less digits than its factorization.

20726806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10363405.

The product of its (nonzero) digits is 8064, while the sum is 31.

The square root of 20726806 is about 4552.6702054948. The cubic root of 20726806 is about 274.6908084188.

The spelling of 20726806 in words is "twenty million, seven hundred twenty-six thousand, eight hundred six".