20954138 has 4 divisors (see below), whose sum is σ = 31431210. Its totient is φ = 10477068.

The previous prime is 20954137. The next prime is 20954147. The reversal of 20954138 is 83145902.

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., 19333609 + 1620529 = 4397^2 + 1273^2 .

It is not an unprimeable number, because it can be changed into a prime (20954137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5238533 + ... + 5238536.

Almost surely, 2^20954138 is an apocalyptic number.

20954138 is a deficient number, since it is larger than the sum of its proper divisors (10477072).

20954138 is a wasteful number, since it uses less digits than its factorization.

20954138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10477071.

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 20954138 is about 4577.5690054875. The cubic root of 20954138 is about 275.6914303331.

The spelling of 20954138 in words is "twenty million, nine hundred fifty-four thousand, one hundred thirty-eight".