20964820 has 24 divisors (see below), whose sum is σ = 44964864. Its totient is φ = 8207136.

The previous prime is 20964803. The next prime is 20964851. The reversal of 20964820 is 2846902.

It is a congruent number.

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, 10212 + ... + 12091.

It is an arithmetic number, because the mean of its divisors is an integer number (1873536).

Almost surely, 2^20964820 is an apocalyptic number.

20964820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20964820 is an abundant number, since it is smaller than the sum of its proper divisors (24000044).

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

20964820 is a wasteful number, since it uses less digits than its factorization.

20964820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22359 (or 22357 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 20964820 is about 4578.7356333381. The cubic root of 20964820 is about 275.7382696985.

The spelling of 20964820 in words is "twenty million, nine hundred sixty-four thousand, eight hundred twenty".