20988153733 has 4 divisors (see below), whose sum is σ = 20995401420. Its totient is φ = 20980906048.

The previous prime is 20988153713. The next prime is 20988153751. The reversal of 20988153733 is 33735188902.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2909199969 + 18078953764 = 53937^2 + 134458^2 .

It is a cyclic number.

It is not a de Polignac number, because 20988153733 - 2⁵ = 20988153701 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20988153713) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3619498 + ... + 3625291.

It is an arithmetic number, because the mean of its divisors is an integer number (5248850355).

Almost surely, 2^20988153733 is an apocalyptic number.

It is an amenable number.

20988153733 is a deficient number, since it is larger than the sum of its proper divisors (7247687).

20988153733 is an equidigital number, since it uses as much as digits as its factorization.

20988153733 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7247686.

The product of its (nonzero) digits is 1088640, while the sum is 49.

The spelling of 20988153733 in words is "twenty billion, nine hundred eighty-eight million, one hundred fifty-three thousand, seven hundred thirty-three".