20357641 has 4 divisors (see below), whose sum is σ = 20555392. Its totient is φ = 20159892.

The previous prime is 20357639. The next prime is 20357657. The reversal of 20357641 is 14675302.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 14675302 = 2 ⋅7337651.

It is a cyclic number.

It is not a de Polignac number, because 20357641 - 2¹ = 20357639 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20357611) 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, 98721 + ... + 98926.

It is an arithmetic number, because the mean of its divisors is an integer number (5138848).

Almost surely, 2^20357641 is an apocalyptic number.

It is an amenable number.

20357641 is a deficient number, since it is larger than the sum of its proper divisors (197751).

20357641 is a wasteful number, since it uses less digits than its factorization.

20357641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 197750.

The product of its (nonzero) digits is 5040, while the sum is 28.

The square root of 20357641 is about 4511.9442594075. The cubic root of 20357641 is about 273.0501904706.

The spelling of 20357641 in words is "twenty million, three hundred fifty-seven thousand, six hundred forty-one".