20606139 has 6 divisors (see below), whose sum is σ = 29764436. Its totient is φ = 13737420.

The previous prime is 20606119. The next prime is 20606141. The reversal of 20606139 is 93160602.

It is a happy number.

20606139 is a `hidden beast` number, since 20 + 606 + 1 + 39 = 666.

It is not a de Polignac number, because 20606139 - 2¹⁶ = 20540603 is a prime.

It is a super-2 number, since 2×20606139² = 849225928974642, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20606119) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1144777 + ... + 1144794.

Almost surely, 2^20606139 is an apocalyptic number.

20606139 is a deficient number, since it is larger than the sum of its proper divisors (9158297).

20606139 is a wasteful number, since it uses less digits than its factorization.

20606139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2289577 (or 2289574 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 27.

The square root of 20606139 is about 4539.3985284396. The cubic root of 20606139 is about 274.1567070268.

The spelling of 20606139 in words is "twenty million, six hundred six thousand, one hundred thirty-nine".