20992398 has 16 divisors (see below), whose sum is σ = 47982720. Its totient is φ = 5997816.

The previous prime is 20992393. The next prime is 20992403. The reversal of 20992398 is 89329902.

It is an interprime number because it is at equal distance from previous prime (20992393) and next prime (20992403).

It is a Harshad number since it is a multiple of its sum of digits (42), and also a Moran number because the ratio is a prime number: 499819 = 20992398 / (2 + 0 + 9 + 9 + 2 + 3 + 9 + 8).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20992393) 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, 249868 + ... + 249951.

It is an arithmetic number, because the mean of its divisors is an integer number (2998920).

Almost surely, 2^20992398 is an apocalyptic number.

20992398 is an abundant number, since it is smaller than the sum of its proper divisors (26990322).

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

20992398 is a wasteful number, since it uses less digits than its factorization.

20992398 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 499831.

The product of its (nonzero) digits is 69984, while the sum is 42.

The square root of 20992398 is about 4581.7461736766. The cubic root of 20992398 is about 275.8591226018.

The spelling of 20992398 in words is "twenty million, nine hundred ninety-two thousand, three hundred ninety-eight".