20992378 has 16 divisors (see below), whose sum is σ = 36159840. Its totient is φ = 9039600.

The previous prime is 20992343. The next prime is 20992379. The reversal of 20992378 is 87329902.

It is a self number, because there is not a number n which added to its sum of digits gives 20992378.

It is not an unprimeable number, because it can be changed into a prime (20992379) 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, 24693 + ... + 25528.

It is an arithmetic number, because the mean of its divisors is an integer number (2259990).

Almost surely, 2^20992378 is an apocalyptic number.

20992378 is a deficient number, since it is larger than the sum of its proper divisors (15167462).

20992378 is a wasteful number, since it uses less digits than its factorization.

20992378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50253.

The product of its (nonzero) digits is 54432, while the sum is 40.

The square root of 20992378 is about 4581.7439911021. The cubic root of 20992378 is about 275.8590349957.

The spelling of 20992378 in words is "twenty million, nine hundred ninety-two thousand, three hundred seventy-eight".