20700139 has 4 divisors (see below), whose sum is σ = 21789640. Its totient is φ = 19610640.

The previous prime is 20700109. The next prime is 20700143. The reversal of 20700139 is 93100702.

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

It is a cyclic number.

It is not a de Polignac number, because 20700139 - 2⁷ = 20700011 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20700109) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 544722 + ... + 544759.

It is an arithmetic number, because the mean of its divisors is an integer number (5447410).

Almost surely, 2^20700139 is an apocalyptic number.

20700139 is a deficient number, since it is larger than the sum of its proper divisors (1089501).

20700139 is a wasteful number, since it uses less digits than its factorization.

20700139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1089500.

The product of its (nonzero) digits is 378, while the sum is 22.

The square root of 20700139 is about 4549.7405420529. The cubic root of 20700139 is about 274.5729526085.

The spelling of 20700139 in words is "twenty million, seven hundred thousand, one hundred thirty-nine".