20747746 has 8 divisors (see below), whose sum is σ = 31308480. Its totient is φ = 10311588.

The previous prime is 20747737. The next prime is 20747767. The reversal of 20747746 is 64774702.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30726 + ... + 31393.

It is an arithmetic number, because the mean of its divisors is an integer number (3913560).

Almost surely, 2^20747746 is an apocalyptic number.

20747746 is a deficient number, since it is larger than the sum of its proper divisors (10560734).

20747746 is a wasteful number, since it uses less digits than its factorization.

20747746 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62288.

The product of its (nonzero) digits is 65856, while the sum is 37.

The square root of 20747746 is about 4554.9693742110. The cubic root of 20747746 is about 274.7832827015.

The spelling of 20747746 in words is "twenty million, seven hundred forty-seven thousand, seven hundred forty-six".