20711398 has 8 divisors (see below), whose sum is σ = 31225392. Its totient is φ = 10302936.

The previous prime is 20711381. The next prime is 20711399. The reversal of 20711398 is 89311702.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×20711398² = 857924014228808, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20711399) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25890 + ... + 26677.

It is an arithmetic number, because the mean of its divisors is an integer number (3903174).

Almost surely, 2^20711398 is an apocalyptic number.

20711398 is a deficient number, since it is larger than the sum of its proper divisors (10513994).

20711398 is a wasteful number, since it uses less digits than its factorization.

20711398 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52766.

The product of its (nonzero) digits is 3024, while the sum is 31.

The square root of 20711398 is about 4550.9776971548. The cubic root of 20711398 is about 274.6227245217.

The spelling of 20711398 in words is "twenty million, seven hundred eleven thousand, three hundred ninety-eight".