20761623601 has 4 divisors (see below), whose sum is σ = 21664302912. Its totient is φ = 19858944292.

The previous prime is 20761623581. The next prime is 20761623607. The reversal of 20761623601 is 10632616702.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 10632616702 = 2 ⋅5316308351.

It is a cyclic number.

It is not a de Polignac number, because 20761623601 - 2²⁷ = 20627405873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20761623607) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 451339621 + ... + 451339666.

It is an arithmetic number, because the mean of its divisors is an integer number (5416075728).

Almost surely, 2^20761623601 is an apocalyptic number.

It is an amenable number.

20761623601 is a deficient number, since it is larger than the sum of its proper divisors (902679311).

20761623601 is an equidigital number, since it uses as much as digits as its factorization.

20761623601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 902679310.

The product of its (nonzero) digits is 18144, while the sum is 34.

The spelling of 20761623601 in words is "twenty billion, seven hundred sixty-one million, six hundred twenty-three thousand, six hundred one".