20642434 has 8 divisors (see below), whose sum is σ = 31718988. Its totient is φ = 10069440.

The previous prime is 20642423. The next prime is 20642443. The reversal of 20642434 is 43424602.

It can be written as a sum of positive squares in 2 ways, for example, as 16378209 + 4264225 = 4047^2 + 2065^2 .

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

It is a super-2 number, since 2×20642434² = 852220162888712, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20642399 and 20642408.

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, 125787 + ... + 125950.

Almost surely, 2^20642434 is an apocalyptic number.

20642434 is a deficient number, since it is larger than the sum of its proper divisors (11076554).

20642434 is a wasteful number, since it uses less digits than its factorization.

20642434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 251780.

The product of its (nonzero) digits is 4608, while the sum is 25.

The square root of 20642434 is about 4543.3945459315. The cubic root of 20642434 is about 274.3175762579.

The spelling of 20642434 in words is "twenty million, six hundred forty-two thousand, four hundred thirty-four".