20694261025 has 9 divisors (see below), whose sum is σ = 25661775603. Its totient is φ = 16554833400.

The previous prime is 20694261019. The next prime is 20694261031. The reversal of 20694261025 is 52016249602.

The square root of 20694261025 is 143855.

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

It is an interprime number because it is at equal distance from previous prime (20694261019) and next prime (20694261031).

It can be written as a sum of positive squares in only one way, i.e., 7449933969 + 13244327056 = 86313^2 + 115084^2 .

It is not a de Polignac number, because 20694261025 - 2⁷ = 20694260897 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 704890 + ... + 733660.

Almost surely, 2^20694261025 is an apocalyptic number.

20694261025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20694261025 is the 143855-th square number.

20694261025 is the 71928-th centered octagonal number.

It is an amenable number.

20694261025 is a deficient number, since it is larger than the sum of its proper divisors (4967514578).

20694261025 is an frugal number, since it uses more digits than its factorization.

20694261025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57552 (or 28776 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 37.

The spelling of 20694261025 in words is "twenty billion, six hundred ninety-four million, two hundred sixty-one thousand, twenty-five".