20953793587 has 8 divisors (see below), whose sum is σ = 21192617520. Its totient is φ = 20717660656.

The previous prime is 20953793557. The next prime is 20953793621. The reversal of 20953793587 is 78539735902.

It is not a de Polignac number, because 20953793587 - 2²³ = 20945404979 is a prime.

It is a super-2 number, since 2×20953793587² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20953793507) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 690108 + ... + 719830.

It is an arithmetic number, because the mean of its divisors is an integer number (2649077190).

Almost surely, 2^20953793587 is an apocalyptic number.

20953793587 is a deficient number, since it is larger than the sum of its proper divisors (238823933).

20953793587 is an frugal number, since it uses more digits than its factorization.

20953793587 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29990 (or 29812 counting only the distinct ones).

The product of its (nonzero) digits is 14288400, while the sum is 58.

The spelling of 20953793587 in words is "twenty billion, nine hundred fifty-three million, seven hundred ninety-three thousand, five hundred eighty-seven".