20342554561 has 16 divisors (see below), whose sum is σ = 23640629760. Its totient is φ = 17142742080.

The previous prime is 20342554553. The next prime is 20342554597. The reversal of 20342554561 is 16545524302.

It is a cyclic number.

It is not a de Polignac number, because 20342554561 - 2³ = 20342554553 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20342554561.

It is not an unprimeable number, because it can be changed into a prime (20342554961) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1035135 + ... + 1054603.

It is an arithmetic number, because the mean of its divisors is an integer number (1477539360).

Almost surely, 2^20342554561 is an apocalyptic number.

It is an amenable number.

20342554561 is a deficient number, since it is larger than the sum of its proper divisors (3298075199).

20342554561 is a wasteful number, since it uses less digits than its factorization.

20342554561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21984.

The product of its (nonzero) digits is 144000, while the sum is 37.

The spelling of 20342554561 in words is "twenty billion, three hundred forty-two million, five hundred fifty-four thousand, five hundred sixty-one".