20348657 has 4 divisors (see below), whose sum is σ = 23255616. Its totient is φ = 17441700.

The previous prime is 20348641. The next prime is 20348663. The reversal of 20348657 is 75684302.

It is a happy number.

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: 75684302 = 2 ⋅37842151.

It is a cyclic number.

It is not a de Polignac number, because 20348657 - 2⁴ = 20348641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20348257) 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, 1453469 + ... + 1453482.

It is an arithmetic number, because the mean of its divisors is an integer number (5813904).

Almost surely, 2^20348657 is an apocalyptic number.

It is an amenable number.

20348657 is a deficient number, since it is larger than the sum of its proper divisors (2906959).

20348657 is an equidigital number, since it uses as much as digits as its factorization.

20348657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2906958.

The product of its (nonzero) digits is 40320, while the sum is 35.

The square root of 20348657 is about 4510.9485698686. The cubic root of 20348657 is about 273.0100181039.

The spelling of 20348657 in words is "twenty million, three hundred forty-eight thousand, six hundred fifty-seven".