20421982 has 8 divisors (see below), whose sum is σ = 35009136. Its totient is φ = 8752272.

The previous prime is 20421971. The next prime is 20421997. The reversal of 20421982 is 28912402.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 20421982.

It is a congruent number.

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, 729343 + ... + 729370.

It is an arithmetic number, because the mean of its divisors is an integer number (4376142).

Almost surely, 2^20421982 is an apocalyptic number.

20421982 is a deficient number, since it is larger than the sum of its proper divisors (14587154).

20421982 is a wasteful number, since it uses less digits than its factorization.

20421982 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1458722.

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 20421982 is about 4519.0687093692. The cubic root of 20421982 is about 273.3375493434.

The spelling of 20421982 in words is "twenty million, four hundred twenty-one thousand, nine hundred eighty-two".