20802142 has 4 divisors (see below), whose sum is σ = 31203216. Its totient is φ = 10401070.

The previous prime is 20802139. The next prime is 20802151. The reversal of 20802142 is 24120802.

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

It is a super-2 number, since 2×20802142² = 865458223576328, which contains 22 as substring.

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, 5200534 + ... + 5200537.

It is an arithmetic number, because the mean of its divisors is an integer number (7800804).

Almost surely, 2^20802142 is an apocalyptic number.

20802142 is a deficient number, since it is larger than the sum of its proper divisors (10401074).

20802142 is a wasteful number, since it uses less digits than its factorization.

20802142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10401073.

The product of its (nonzero) digits is 256, while the sum is 19.

The square root of 20802142 is about 4560.9365266357. The cubic root of 20802142 is about 275.0232134674.

Adding to 20802142 its reverse (24120802), we get a palindrome (44922944).

The spelling of 20802142 in words is "twenty million, eight hundred two thousand, one hundred forty-two".