20964678 has 16 divisors (see below), whose sum is σ = 47919360. Its totient is φ = 5989896.

The previous prime is 20964677. The next prime is 20964701. The reversal of 20964678 is 87646902.

It is a Harshad number since it is a multiple of its sum of digits (42), and also a Moran number because the ratio is a prime number: 499159 = 20964678 / (2 + 0 + 9 + 6 + 4 + 6 + 7 + 8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20964673) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 249538 + ... + 249621.

It is an arithmetic number, because the mean of its divisors is an integer number (2994960).

Almost surely, 2^20964678 is an apocalyptic number.

20964678 is an abundant number, since it is smaller than the sum of its proper divisors (26954682).

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

20964678 is a wasteful number, since it uses less digits than its factorization.

20964678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 499171.

The product of its (nonzero) digits is 145152, while the sum is 42.

The square root of 20964678 is about 4578.7201268477. The cubic root of 20964678 is about 275.7376471488.

The spelling of 20964678 in words is "twenty million, nine hundred sixty-four thousand, six hundred seventy-eight".