20601239 has 4 divisors (see below), whose sum is σ = 20715240. Its totient is φ = 20487240.

The previous prime is 20601233. The next prime is 20601241. The reversal of 20601239 is 93210602.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93210602 = 2 ⋅46605301.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20601239 is a prime.

It is a super-2 number, since 2×20601239² = 848822096670242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20601233) 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, 56729 + ... + 57090.

It is an arithmetic number, because the mean of its divisors is an integer number (5178810).

Almost surely, 2^20601239 is an apocalyptic number.

20601239 is a deficient number, since it is larger than the sum of its proper divisors (114001).

20601239 is a wasteful number, since it uses less digits than its factorization.

20601239 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114000.

The product of its (nonzero) digits is 648, while the sum is 23.

The square root of 20601239 is about 4538.8587772699. The cubic root of 20601239 is about 274.1349744360.

The spelling of 20601239 in words is "twenty million, six hundred one thousand, two hundred thirty-nine".