20353420637 has 4 divisors (see below), whose sum is σ = 22203731616. Its totient is φ = 18503109660.

The previous prime is 20353420627. The next prime is 20353420651. The reversal of 20353420637 is 73602435302.

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.

It is a cyclic number.

It is not a de Polignac number, because 20353420637 - 2⁴ = 20353420621 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20353420597 and 20353420606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20353420627) 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, 925155473 + ... + 925155494.

It is an arithmetic number, because the mean of its divisors is an integer number (5550932904).

Almost surely, 2^20353420637 is an apocalyptic number.

It is an amenable number.

20353420637 is a deficient number, since it is larger than the sum of its proper divisors (1850310979).

20353420637 is a wasteful number, since it uses less digits than its factorization.

20353420637 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1850310978.

The product of its (nonzero) digits is 90720, while the sum is 35.

Adding to 20353420637 its reverse (73602435302), we get a palindrome (93955855939).

The spelling of 20353420637 in words is "twenty billion, three hundred fifty-three million, four hundred twenty thousand, six hundred thirty-seven".