20400229987 has 2 divisors, whose sum is σ = 20400229988. Its totient is φ = 20400229986.

The previous prime is 20400229981. The next prime is 20400230063. The reversal of 20400229987 is 78992200402.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20400229987 - 2¹⁵ = 20400197219 is a prime.

It is not a weakly prime, because it can be changed into another prime (20400229981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10200114993 + 10200114994.

It is an arithmetic number, because the mean of its divisors is an integer number (10200114994).

Almost surely, 2^20400229987 is an apocalyptic number.

20400229987 is a deficient number, since it is larger than the sum of its proper divisors (1).

20400229987 is an equidigital number, since it uses as much as digits as its factorization.

20400229987 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 145152, while the sum is 43.

The spelling of 20400229987 in words is "twenty billion, four hundred million, two hundred twenty-nine thousand, nine hundred eighty-seven".