20543620361 has 16 divisors (see below), whose sum is σ = 23451099648. Its totient is φ = 17825961600.

The previous prime is 20543620303. The next prime is 20543620373. The reversal of 20543620361 is 16302634502.

It is a cyclic number.

It is not a de Polignac number, because 20543620361 - 2²² = 20539426057 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20543620661) 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, 387746 + ... + 437531.

It is an arithmetic number, because the mean of its divisors is an integer number (1465693728).

Almost surely, 2^20543620361 is an apocalyptic number.

It is an amenable number.

20543620361 is a deficient number, since it is larger than the sum of its proper divisors (2907479287).

20543620361 is a wasteful number, since it uses less digits than its factorization.

20543620361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 825392.

The product of its (nonzero) digits is 25920, while the sum is 32.

The spelling of 20543620361 in words is "twenty billion, five hundred forty-three million, six hundred twenty thousand, three hundred sixty-one".