20042429987 has 2 divisors, whose sum is σ = 20042429988. Its totient is φ = 20042429986.

The previous prime is 20042429951. The next prime is 20042430061. The reversal of 20042429987 is 78992424002.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20042429987 - 2⁶ = 20042429923 is a prime.

It is not a weakly prime, because it can be changed into another prime (20042429947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10021214993 + 10021214994.

It is an arithmetic number, because the mean of its divisors is an integer number (10021214994).

Almost surely, 2^20042429987 is an apocalyptic number.

20042429987 is a deficient number, since it is larger than the sum of its proper divisors (1).

20042429987 is an equidigital number, since it uses as much as digits as its factorization.

20042429987 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 580608, while the sum is 47.

The spelling of 20042429987 in words is "twenty billion, forty-two million, four hundred twenty-nine thousand, nine hundred eighty-seven".