20497123653 has 4 divisors (see below), whose sum is σ = 27329498208. Its totient is φ = 13664749100.

The previous prime is 20497123649. The next prime is 20497123663. The reversal of 20497123653 is 35632179402.

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 20497123653 - 2² = 20497123649 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20497123613) 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, 3416187273 + ... + 3416187278.

It is an arithmetic number, because the mean of its divisors is an integer number (6832374552).

Almost surely, 2^20497123653 is an apocalyptic number.

It is an amenable number.

20497123653 is a deficient number, since it is larger than the sum of its proper divisors (6832374555).

20497123653 is an equidigital number, since it uses as much as digits as its factorization.

20497123653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6832374554.

The product of its (nonzero) digits is 272160, while the sum is 42.

The spelling of 20497123653 in words is "twenty billion, four hundred ninety-seven million, one hundred twenty-three thousand, six hundred fifty-three".