20890964 has 12 divisors (see below), whose sum is σ = 36610644. Its totient is φ = 10430784.

The previous prime is 20890949. The next prime is 20890979. The reversal of 20890964 is 46909802.

It is an interprime number because it is at equal distance from previous prime (20890949) and next prime (20890979).

It can be written as a sum of positive squares in 2 ways, for example, as 8584900 + 12306064 = 2930^2 + 3508^2 .

It is a congruent number.

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, 89 + ... + 6464.

It is an arithmetic number, because the mean of its divisors is an integer number (3050887).

Almost surely, 2^20890964 is an apocalyptic number.

It is an amenable number.

20890964 is a deficient number, since it is larger than the sum of its proper divisors (15719680).

20890964 is a wasteful number, since it uses less digits than its factorization.

20890964 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7354 (or 7352 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 38.

The square root of 20890964 is about 4570.6634091781. The cubic root of 20890964 is about 275.4140935027.

The spelling of 20890964 in words is "twenty million, eight hundred ninety thousand, nine hundred sixty-four".