20400298 has 4 divisors (see below), whose sum is σ = 30600450. Its totient is φ = 10200148.

The previous prime is 20400277. The next prime is 20400301. The reversal of 20400298 is 89200402.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 10647169 + 9753129 = 3263^2 + 3123^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5100073 + ... + 5100076.

Almost surely, 2^20400298 is an apocalyptic number.

20400298 is a deficient number, since it is larger than the sum of its proper divisors (10200152).

20400298 is a wasteful number, since it uses less digits than its factorization.

20400298 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10200151.

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 20400298 is about 4516.6689052885. The cubic root of 20400298 is about 273.2407720826.

The spelling of 20400298 in words is "twenty million, four hundred thousand, two hundred ninety-eight".