20679642 has 24 divisors (see below), whose sum is σ = 44898516. Its totient is φ = 6878976.

The previous prime is 20679641. The next prime is 20679643. The reversal of 20679642 is 24697602.

It is a happy number.

20679642 is a `hidden beast` number, since 2 + 0 + 6 + 7 + 9 + 642 = 666.

It is an interprime number because it is at equal distance from previous prime (20679641) and next prime (20679643).

It can be written as a sum of positive squares in 2 ways, for example, as 13111641 + 7568001 = 3621^2 + 2751^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20679597 and 20679606.

It is not an unprimeable number, because it can be changed into a prime (20679641) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11338 + ... + 13034.

Almost surely, 2^20679642 is an apocalyptic number.

20679642 is an abundant number, since it is smaller than the sum of its proper divisors (24218874).

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

20679642 is a wasteful number, since it uses less digits than its factorization.

20679642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2382 (or 2379 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 36.

The square root of 20679642 is about 4547.4874381355. The cubic root of 20679642 is about 274.4822965281.

It can be divided in two parts, 20679 and 642, that added together give a triangular number (21321 = T₂₀₆).

The spelling of 20679642 in words is "twenty million, six hundred seventy-nine thousand, six hundred forty-two".