20698378 has 4 divisors (see below), whose sum is σ = 31047570. Its totient is φ = 10349188.

The previous prime is 20698369. The next prime is 20698387. The reversal of 20698378 is 87389602.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 87389602 = 2 ⋅43694801.

It is an interprime number because it is at equal distance from previous prime (20698369) and next prime (20698387).

It can be written as a sum of positive squares in only one way, i.e., 10413529 + 10284849 = 3227^2 + 3207^2 .

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 5174593 + ... + 5174596.

Almost surely, 2^20698378 is an apocalyptic number.

20698378 is a deficient number, since it is larger than the sum of its proper divisors (10349192).

20698378 is a wasteful number, since it uses less digits than its factorization.

20698378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10349191.

The product of its (nonzero) digits is 145152, while the sum is 43.

The square root of 20698378 is about 4549.5470104176. The cubic root of 20698378 is about 274.5651662408.

The spelling of 20698378 in words is "twenty million, six hundred ninety-eight thousand, three hundred seventy-eight".