20497998 has 16 divisors (see below), whose sum is σ = 43153920. Its totient is φ = 6473016.

The previous prime is 20497993. The next prime is 20497999. The reversal of 20497998 is 89979402.

It is a happy number.

20497998 is nontrivially palindromic in base 7.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20497993) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 89790 + ... + 90017.

It is an arithmetic number, because the mean of its divisors is an integer number (2697120).

Almost surely, 2^20497998 is an apocalyptic number.

20497998 is an abundant number, since it is smaller than the sum of its proper divisors (22655922).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20497998 is a wasteful number, since it uses less digits than its factorization.

20497998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179831.

The product of its (nonzero) digits is 326592, while the sum is 48.

The square root of 20497998 is about 4527.4714797556. The cubic root of 20497998 is about 273.6762742184.

The spelling of 20497998 in words is "twenty million, four hundred ninety-seven thousand, nine hundred ninety-eight".