20729822 has 4 divisors (see below), whose sum is σ = 31094736. Its totient is φ = 10364910.

The previous prime is 20729789. The next prime is 20729861. The reversal of 20729822 is 22892702.

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, 5182454 + ... + 5182457.

It is an arithmetic number, because the mean of its divisors is an integer number (7773684).

Almost surely, 2^20729822 is an apocalyptic number.

20729822 is a deficient number, since it is larger than the sum of its proper divisors (10364914).

20729822 is a wasteful number, since it uses less digits than its factorization.

20729822 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10364913.

The product of its (nonzero) digits is 8064, while the sum is 32.

The square root of 20729822 is about 4553.0014276299. The cubic root of 20729822 is about 274.7041313801.

The spelling of 20729822 in words is "twenty million, seven hundred twenty-nine thousand, eight hundred twenty-two".