20401340087 has 2 divisors, whose sum is σ = 20401340088. Its totient is φ = 20401340086.

The previous prime is 20401340083. The next prime is 20401340107. The reversal of 20401340087 is 78004310402.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20401340087 - 2² = 20401340083 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20401340081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10200670043 + 10200670044.

It is an arithmetic number, because the mean of its divisors is an integer number (10200670044).

Almost surely, 2^20401340087 is an apocalyptic number.

20401340087 is a deficient number, since it is larger than the sum of its proper divisors (1).

20401340087 is an equidigital number, since it uses as much as digits as its factorization.

20401340087 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5376, while the sum is 29.

Adding to 20401340087 its reverse (78004310402), we get a palindrome (98405650489).

The spelling of 20401340087 in words is "twenty billion, four hundred one million, three hundred forty thousand, eighty-seven".