20021964 has 48 divisors (see below), whose sum is σ = 47943168. Its totient is φ = 6501888.

The previous prime is 20021951. The next prime is 20021999. The reversal of 20021964 is 46912002.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 119809 + ... + 119975.

It is an arithmetic number, because the mean of its divisors is an integer number (998816).

Almost surely, 2^20021964 is an apocalyptic number.

It is an amenable number.

20021964 is an abundant number, since it is smaller than the sum of its proper divisors (27921204).

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

20021964 is a wasteful number, since it uses less digits than its factorization.

20021964 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 374 (or 372 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 20021964 is about 4474.5909310238. The cubic root of 20021964 is about 271.5410910881.

Adding to 20021964 its reverse (46912002), we get a palindrome (66933966).

The spelling of 20021964 in words is "twenty million, twenty-one thousand, nine hundred sixty-four".