20136898 has 4 divisors (see below), whose sum is σ = 30205350. Its totient is φ = 10068448.

The previous prime is 20136871. The next prime is 20136899. The reversal of 20136898 is 89863102.

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., 12938409 + 7198489 = 3597^2 + 2683^2 .

It is a super-2 number, since 2×20136898² = 810989322124808, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20136899) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5034223 + ... + 5034226.

Almost surely, 2^20136898 is an apocalyptic number.

20136898 is a deficient number, since it is larger than the sum of its proper divisors (10068452).

20136898 is a wasteful number, since it uses less digits than its factorization.

20136898 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10068451.

The product of its (nonzero) digits is 20736, while the sum is 37.

The square root of 20136898 is about 4487.4155145250. The cubic root of 20136898 is about 272.0596844948.

It can be divided in two parts, 2013 and 6898, that added together give a triangular number (8911 = T₁₃₃).

The spelling of 20136898 in words is "twenty million, one hundred thirty-six thousand, eight hundred ninety-eight".