20348138 has 4 divisors (see below), whose sum is σ = 30522210. Its totient is φ = 10174068.

The previous prime is 20348137. The next prime is 20348147. The reversal of 20348138 is 83184302.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 83184302 = 2 ⋅41592151.

It can be written as a sum of positive squares in only one way, i.e., 15626209 + 4721929 = 3953^2 + 2173^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 20348138.

It is not an unprimeable number, because it can be changed into a prime (20348137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5087033 + ... + 5087036.

Almost surely, 2^20348138 is an apocalyptic number.

20348138 is a deficient number, since it is larger than the sum of its proper divisors (10174072).

20348138 is a wasteful number, since it uses less digits than its factorization.

20348138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10174071.

The product of its (nonzero) digits is 4608, while the sum is 29.

The square root of 20348138 is about 4510.8910427985. The cubic root of 20348138 is about 273.0076970105.

It can be divided in two parts, 203481 and 38, that multiplied together give a triangular number (7732278 = T₃₉₃₂).

The spelling of 20348138 in words is "twenty million, three hundred forty-eight thousand, one hundred thirty-eight".