20840746 has 8 divisors (see below), whose sum is σ = 31304484. Its totient is φ = 10405920.

The previous prime is 20840717. The next prime is 20840761. The reversal of 20840746 is 64704802.

It can be written as a sum of positive squares in 2 ways, for example, as 20839225 + 1521 = 4565^2 + 39^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5325 + ... + 8368.

Almost surely, 2^20840746 is an apocalyptic number.

20840746 is a deficient number, since it is larger than the sum of its proper divisors (10463738).

20840746 is a wasteful number, since it uses less digits than its factorization.

20840746 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14456.

The product of its (nonzero) digits is 10752, while the sum is 31.

The square root of 20840746 is about 4565.1665906076. The cubic root of 20840746 is about 275.1932349861.

The spelling of 20840746 in words is "twenty million, eight hundred forty thousand, seven hundred forty-six".