20700138 has 16 divisors (see below), whose sum is σ = 43200576. Its totient is φ = 6600000.

The previous prime is 20700109. The next prime is 20700143. The reversal of 20700138 is 83100702.

20700138 is nontrivially palindromic in base 12.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 74863 + ... + 75138.

It is an arithmetic number, because the mean of its divisors is an integer number (2700036).

Almost surely, 2^20700138 is an apocalyptic number.

20700138 is an abundant number, since it is smaller than the sum of its proper divisors (22500438).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20700138 is a wasteful number, since it uses less digits than its factorization.

20700138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150029.

The product of its (nonzero) digits is 336, while the sum is 21.

The square root of 20700138 is about 4549.7404321565. The cubic root of 20700138 is about 274.5729481871.

The spelling of 20700138 in words is "twenty million, seven hundred thousand, one hundred thirty-eight".