20942431225 has 27 divisors (see below), whose sum is σ = 26316838029. Its totient is φ = 16532241600.

The previous prime is 20942431219. The next prime is 20942431243. The reversal of 20942431225 is 52213424902.

The square root of 20942431225 is 144715.

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

It can be written as a sum of positive squares in 4 ways, for example, as 29800681 + 20912630544 = 5459^2 + 144612^2 .

It is a de Polignac number, because none of the positive numbers 2^k-20942431225 is a prime.

It is a super-2 number, since 2×20942431225² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 74528085 + ... + 74528365.

Almost surely, 2^20942431225 is an apocalyptic number.

20942431225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20942431225 is the 144715-th square number.

20942431225 is the 72358-th centered octagonal number.

It is an amenable number.

20942431225 is a deficient number, since it is larger than the sum of its proper divisors (5374406804).

20942431225 is an frugal number, since it uses more digits than its factorization.

20942431225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 778 (or 389 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 34.

The spelling of 20942431225 in words is "twenty billion, nine hundred forty-two million, four hundred thirty-one thousand, two hundred twenty-five".