20925859261 has 4 divisors (see below), whose sum is σ = 20926202400. Its totient is φ = 20925516124.

The previous prime is 20925859259. The next prime is 20925859267. The reversal of 20925859261 is 16295852902.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20925859261 - 2¹ = 20925859259 is a prime.

It is a super-2 number, since 2×20925859261² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20925859267) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52591 + ... + 211228.

It is an arithmetic number, because the mean of its divisors is an integer number (5231550600).

Almost surely, 2^20925859261 is an apocalyptic number.

It is an amenable number.

20925859261 is a deficient number, since it is larger than the sum of its proper divisors (343139).

20925859261 is an equidigital number, since it uses as much as digits as its factorization.

20925859261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 343138.

The product of its (nonzero) digits is 777600, while the sum is 49.

The spelling of 20925859261 in words is "twenty billion, nine hundred twenty-five million, eight hundred fifty-nine thousand, two hundred sixty-one".