20278350011 has 4 divisors (see below), whose sum is σ = 20294156712. Its totient is φ = 20262543312.

The previous prime is 20278349999. The next prime is 20278350049. The reversal of 20278350011 is 11005387202.

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 20278350011 - 2¹⁸ = 20278087867 is a prime.

It is a super-2 number, since 2×20278350011² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20278350611) 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, 7901426 + ... + 7903991.

It is an arithmetic number, because the mean of its divisors is an integer number (5073539178).

Almost surely, 2^20278350011 is an apocalyptic number.

20278350011 is a deficient number, since it is larger than the sum of its proper divisors (15806701).

20278350011 is a wasteful number, since it uses less digits than its factorization.

20278350011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15806700.

The product of its (nonzero) digits is 3360, while the sum is 29.

The spelling of 20278350011 in words is "twenty billion, two hundred seventy-eight million, three hundred fifty thousand, eleven".