20621994 has 16 divisors (see below), whose sum is σ = 41332032. Its totient is φ = 6859328.

The previous prime is 20621981. The next prime is 20621999. The reversal of 20621994 is 49912602.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a plaindrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (20621999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 399 + ... + 6434.

It is an arithmetic number, because the mean of its divisors is an integer number (2583252).

Almost surely, 2^20621994 is an apocalyptic number.

20621994 is an abundant number, since it is smaller than the sum of its proper divisors (20710038).

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

20621994 is a wasteful number, since it uses less digits than its factorization.

20621994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7341.

The product of its (nonzero) digits is 7776, while the sum is 33.

The square root of 20621994 is about 4541.1445693790. The cubic root of 20621994 is about 274.2270038806.

The spelling of 20621994 in words is "twenty million, six hundred twenty-one thousand, nine hundred ninety-four".