20964818 has 16 divisors (see below), whose sum is σ = 36130560. Its totient is φ = 8937216.

The previous prime is 20964803. The next prime is 20964851. The reversal of 20964818 is 81846902.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1178 + ... + 6581.

It is an arithmetic number, because the mean of its divisors is an integer number (2258160).

Almost surely, 2^20964818 is an apocalyptic number.

20964818 is a deficient number, since it is larger than the sum of its proper divisors (15165742).

20964818 is a wasteful number, since it uses less digits than its factorization.

20964818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7961.

The product of its (nonzero) digits is 27648, while the sum is 38.

The square root of 20964818 is about 4578.7354149372. The cubic root of 20964818 is about 275.7382609302.

The spelling of 20964818 in words is "twenty million, nine hundred sixty-four thousand, eight hundred eighteen".