20743442 has 4 divisors (see below), whose sum is σ = 31115166. Its totient is φ = 10371720.

The previous prime is 20743427. The next prime is 20743453. The reversal of 20743442 is 24434702.

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., 14891881 + 5851561 = 3859^2 + 2419^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5185859 + ... + 5185862.

Almost surely, 2^20743442 is an apocalyptic number.

20743442 is a deficient number, since it is larger than the sum of its proper divisors (10371724).

20743442 is a wasteful number, since it uses less digits than its factorization.

20743442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10371723.

The product of its (nonzero) digits is 5376, while the sum is 26.

The square root of 20743442 is about 4554.4968986706. The cubic root of 20743442 is about 274.7642806529.

The spelling of 20743442 in words is "twenty million, seven hundred forty-three thousand, four hundred forty-two".