20025206957 has 12 divisors (see below), whose sum is σ = 23415337116. Its totient is φ = 17075520000.

The previous prime is 20025206953. The next prime is 20025206987. The reversal of 20025206957 is 75960252002.

It can be written as a sum of positive squares in 2 ways, for example, as 13570852036 + 6454354921 = 116494^2 + 80339^2 .

It is not a de Polignac number, because 20025206957 - 2² = 20025206953 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20025206957.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20025206953) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1049294 + ... + 1068207.

It is an arithmetic number, because the mean of its divisors is an integer number (1951278093).

Almost surely, 2^20025206957 is an apocalyptic number.

It is an amenable number.

20025206957 is a deficient number, since it is larger than the sum of its proper divisors (3390130159).

20025206957 is a wasteful number, since it uses less digits than its factorization.

20025206957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2117708 (or 2117701 counting only the distinct ones).

The product of its (nonzero) digits is 75600, while the sum is 38.

Adding to 20025206957 its reverse (75960252002), we get a palindrome (95985458959).

The spelling of 20025206957 in words is "twenty billion, twenty-five million, two hundred six thousand, nine hundred fifty-seven".