20898357053 has 4 divisors (see below), whose sum is σ = 23883836640. Its totient is φ = 17912877468.

The previous prime is 20898357049. The next prime is 20898357079. The reversal of 20898357053 is 35075389802.

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 20898357053 - 2² = 20898357049 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20898356992 and 20898357010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20898357853) 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, 1492739783 + ... + 1492739796.

It is an arithmetic number, because the mean of its divisors is an integer number (5970959160).

Almost surely, 2^20898357053 is an apocalyptic number.

It is an amenable number.

20898357053 is a deficient number, since it is larger than the sum of its proper divisors (2985479587).

20898357053 is an equidigital number, since it uses as much as digits as its factorization.

20898357053 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2985479586.

The product of its (nonzero) digits is 1814400, while the sum is 50.

The spelling of 20898357053 in words is "twenty billion, eight hundred ninety-eight million, three hundred fifty-seven thousand, fifty-three".