20808351001 has 9 divisors (see below), whose sum is σ = 21133374591. Its totient is φ = 20488258032.

The previous prime is 20808350939. The next prime is 20808351007. The reversal of 20808351001 is 10015380802.

The square root of 20808351001 is 144251.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 1536248025 + 19272102976 = 39195^2 + 138824^2 .

It is not a de Polignac number, because 20808351001 - 2¹³ = 20808342809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20808351007) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 9663741 + ... + 9665893.

Almost surely, 2^20808351001 is an apocalyptic number.

20808351001 is the 144251-st square number.

20808351001 is the 72126-th centered octagonal number.

It is an amenable number.

20808351001 is a deficient number, since it is larger than the sum of its proper divisors (325023590).

20808351001 is an frugal number, since it uses more digits than its factorization.

20808351001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4440 (or 2220 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 28.

The spelling of 20808351001 in words is "twenty billion, eight hundred eight million, three hundred fifty-one thousand, one".