20964858 has 16 divisors (see below), whose sum is σ = 42952896. Its totient is φ = 6817760.

The previous prime is 20964857. The next prime is 20964871. The reversal of 20964858 is 85846902.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20964851) 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, 42366 + ... + 42857.

It is an arithmetic number, because the mean of its divisors is an integer number (2684556).

Almost surely, 2^20964858 is an apocalyptic number.

20964858 is an abundant number, since it is smaller than the sum of its proper divisors (21988038).

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

20964858 is a wasteful number, since it uses less digits than its factorization.

20964858 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85269.

The product of its (nonzero) digits is 138240, while the sum is 42.

The square root of 20964858 is about 4578.7397829534. The cubic root of 20964858 is about 275.7384362958.

The spelling of 20964858 in words is "twenty million, nine hundred sixty-four thousand, eight hundred fifty-eight".