20435587091 has 2 divisors, whose sum is σ = 20435587092. Its totient is φ = 20435587090.

The previous prime is 20435587087. The next prime is 20435587129. The reversal of 20435587091 is 19078553402.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20435587091 - 2² = 20435587087 is a prime.

It is a super-2 number, since 2×20435587091² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20435587021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10217793545 + 10217793546.

It is an arithmetic number, because the mean of its divisors is an integer number (10217793546).

Almost surely, 2^20435587091 is an apocalyptic number.

20435587091 is a deficient number, since it is larger than the sum of its proper divisors (1).

20435587091 is an equidigital number, since it uses as much as digits as its factorization.

20435587091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 302400, while the sum is 44.

The spelling of 20435587091 in words is "twenty billion, four hundred thirty-five million, five hundred eighty-seven thousand, ninety-one".