20453632987 has 2 divisors, whose sum is σ = 20453632988. Its totient is φ = 20453632986.

The previous prime is 20453632961. The next prime is 20453633017. The reversal of 20453632987 is 78923635402.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20453632987 - 2³¹ = 18306149339 is a prime.

It is a super-2 number, since 2×20453632987² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20453632987.

It is not a weakly prime, because it can be changed into another prime (20453332987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10226816493 + 10226816494.

It is an arithmetic number, because the mean of its divisors is an integer number (10226816494).

Almost surely, 2^20453632987 is an apocalyptic number.

20453632987 is a deficient number, since it is larger than the sum of its proper divisors (1).

20453632987 is an equidigital number, since it uses as much as digits as its factorization.

20453632987 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2177280, while the sum is 49.

The spelling of 20453632987 in words is "twenty billion, four hundred fifty-three million, six hundred thirty-two thousand, nine hundred eighty-seven".