20946642 has 16 divisors (see below), whose sum is σ = 43338240. Its totient is φ = 6741392.

The previous prime is 20946619. The next prime is 20946649. The reversal of 20946642 is 24664902.

It is a happy number.

It is a super-2 number, since 2×20946642² = 877523622152328, which contains 22 as substring.

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 not an unprimeable number, because it can be changed into a prime (20946649) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 60018 + ... + 60365.

It is an arithmetic number, because the mean of its divisors is an integer number (2708640).

Almost surely, 2^20946642 is an apocalyptic number.

20946642 is an abundant number, since it is smaller than the sum of its proper divisors (22391598).

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

20946642 is a wasteful number, since it uses less digits than its factorization.

20946642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120417.

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

The square root of 20946642 is about 4576.7501570438. The cubic root of 20946642 is about 275.6585517128.

The spelling of 20946642 in words is "twenty million, nine hundred forty-six thousand, six hundred forty-two".