20730142 has 4 divisors (see below), whose sum is σ = 31095216. Its totient is φ = 10365070.

The previous prime is 20730131. The next prime is 20730167. The reversal of 20730142 is 24103702.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5182534 + ... + 5182537.

It is an arithmetic number, because the mean of its divisors is an integer number (7773804).

Almost surely, 2^20730142 is an apocalyptic number.

20730142 is a deficient number, since it is larger than the sum of its proper divisors (10365074).

20730142 is a wasteful number, since it uses less digits than its factorization.

20730142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10365073.

The product of its (nonzero) digits is 336, while the sum is 19.

The square root of 20730142 is about 4553.0365691481. The cubic root of 20730142 is about 274.7055448810.

Adding to 20730142 its reverse (24103702), we get a palindrome (44833844).

The spelling of 20730142 in words is "twenty million, seven hundred thirty thousand, one hundred forty-two".