20642946 has 8 divisors (see below), whose sum is σ = 41285904. Its totient is φ = 6880980.

The previous prime is 20642903. The next prime is 20642971. The reversal of 20642946 is 64924602.

It is a happy number.

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

20642946 is an admirable number.

It is a super-2 number, since 2×20642946² = 852262439117832, which contains 22 as substring.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 1720240 + ... + 1720251.

It is an arithmetic number, because the mean of its divisors is an integer number (5160738).

Almost surely, 2^20642946 is an apocalyptic number.

20642946 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

20642946 is a wasteful number, since it uses less digits than its factorization.

20642946 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3440496.

The product of its (nonzero) digits is 20736, while the sum is 33.

The square root of 20642946 is about 4543.4508911179. The cubic root of 20642946 is about 274.3198442308.

The spelling of 20642946 in words is "twenty million, six hundred forty-two thousand, nine hundred forty-six".