20477323801 has 9 divisors (see below), whose sum is σ = 22509863103. Its totient is φ = 18614317920.

The previous prime is 20477323799. The next prime is 20477323817. The reversal of 20477323801 is 10832377402.

The square root of 20477323801 is 143099.

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., 4083082201 + 16394241600 = 63899^2 + 128040^2 .

It is not a de Polignac number, because 20477323801 - 2¹ = 20477323799 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20477323831) 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, 1567585 + ... + 1580593.

Almost surely, 2^20477323801 is an apocalyptic number.

20477323801 is the 143099-th square number.

20477323801 is the 71550-th centered octagonal number.

It is an amenable number.

20477323801 is a deficient number, since it is larger than the sum of its proper divisors (2032539302).

20477323801 is an frugal number, since it uses more digits than its factorization.

20477323801 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26040 (or 13020 counting only the distinct ones).

The product of its (nonzero) digits is 56448, while the sum is 37.

The spelling of 20477323801 in words is "twenty billion, four hundred seventy-seven million, three hundred twenty-three thousand, eight hundred one".