20292778651 has 4 divisors (see below), whose sum is σ = 20305252792. Its totient is φ = 20280304512.

The previous prime is 20292778643. The next prime is 20292778657. The reversal of 20292778651 is 15687729202.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20292778651 - 2³ = 20292778643 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20292778595 and 20292778604.

It is not an unprimeable number, because it can be changed into a prime (20292778657) 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, 6234630 + ... + 6237883.

It is an arithmetic number, because the mean of its divisors is an integer number (5076313198).

Almost surely, 2^20292778651 is an apocalyptic number.

20292778651 is a deficient number, since it is larger than the sum of its proper divisors (12474141).

20292778651 is a wasteful number, since it uses less digits than its factorization.

20292778651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12474140.

The product of its (nonzero) digits is 846720, while the sum is 49.

The spelling of 20292778651 in words is "twenty billion, two hundred ninety-two million, seven hundred seventy-eight thousand, six hundred fifty-one".