20710375921 has 9 divisors (see below), whose sum is σ = 21653437771. Its totient is φ = 19806758752.

The previous prime is 20710375849. The next prime is 20710375951. The reversal of 20710375921 is 12957301702.

The square root of 20710375921 is 143911.

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., 20499080625 + 211295296 = 143175^2 + 14536^2 .

It is not a de Polignac number, because 20710375921 - 2¹⁹ = 20709851633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20710375951) 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, 3306825 + ... + 3313081.

Almost surely, 2^20710375921 is an apocalyptic number.

20710375921 is the 143911-st square number.

20710375921 is the 71956-th centered octagonal number.

It is an amenable number.

20710375921 is a deficient number, since it is larger than the sum of its proper divisors (943061850).

20710375921 is an frugal number, since it uses more digits than its factorization.

20710375921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12560 (or 6280 counting only the distinct ones).

The product of its (nonzero) digits is 26460, while the sum is 37.

It can be divided in two parts, 207103 and 75921, that added together give a square (283024 = 532²).

The spelling of 20710375921 in words is "twenty billion, seven hundred ten million, three hundred seventy-five thousand, nine hundred twenty-one".