20021672 has 16 divisors (see below), whose sum is σ = 40953600. Its totient is φ = 9100720.

The previous prime is 20021669. The next prime is 20021689. The reversal of 20021672 is 27612002.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 113672 + ... + 113847.

It is an arithmetic number, because the mean of its divisors is an integer number (2559600).

Almost surely, 2^20021672 is an apocalyptic number.

20021672 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

20021672 is an abundant number, since it is smaller than the sum of its proper divisors (20931928).

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

20021672 is a wasteful number, since it uses less digits than its factorization.

20021672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 227536 (or 227532 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 20.

The square root of 20021672 is about 4474.5583022238. The cubic root of 20021672 is about 271.5397710313.

Adding to 20021672 its reverse (27612002), we get a palindrome (47633674).

The spelling of 20021672 in words is "twenty million, twenty-one thousand, six hundred seventy-two".