20942434 has 4 divisors (see below), whose sum is σ = 31413654. Its totient is φ = 10471216.

The previous prime is 20942423. The next prime is 20942483. The reversal of 20942434 is 43424902.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 16426809 + 4515625 = 4053^2 + 2125^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5235607 + ... + 5235610.

Almost surely, 2^20942434 is an apocalyptic number.

20942434 is a deficient number, since it is larger than the sum of its proper divisors (10471220).

20942434 is a wasteful number, since it uses less digits than its factorization.

20942434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10471219.

The product of its (nonzero) digits is 6912, while the sum is 28.

The square root of 20942434 is about 4576.2904191059. The cubic root of 20942434 is about 275.6400913335.

The spelling of 20942434 in words is "twenty million, nine hundred forty-two thousand, four hundred thirty-four".