20531050987 has 2 divisors, whose sum is σ = 20531050988. Its totient is φ = 20531050986.

The previous prime is 20531050979. The next prime is 20531051059. The reversal of 20531050987 is 78905013502.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20531050987 - 2³ = 20531050979 is a prime.

It is not a weakly prime, because it can be changed into another prime (20531050957) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10265525493 + 10265525494.

It is an arithmetic number, because the mean of its divisors is an integer number (10265525494).

Almost surely, 2^20531050987 is an apocalyptic number.

20531050987 is a deficient number, since it is larger than the sum of its proper divisors (1).

20531050987 is an equidigital number, since it uses as much as digits as its factorization.

20531050987 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 75600, while the sum is 40.

The spelling of 20531050987 in words is "twenty billion, five hundred thirty-one million, fifty thousand, nine hundred eighty-seven".