20651962939 has 4 divisors (see below), whose sum is σ = 20653656840. Its totient is φ = 20650269040.

The previous prime is 20651962927. The next prime is 20651962997. The reversal of 20651962939 is 93926915602.

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 20651962939 - 2¹³ = 20651954747 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20651992939) 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, 828529 + ... + 853090.

It is an arithmetic number, because the mean of its divisors is an integer number (5163414210).

Almost surely, 2^20651962939 is an apocalyptic number.

20651962939 is a deficient number, since it is larger than the sum of its proper divisors (1693901).

20651962939 is a wasteful number, since it uses less digits than its factorization.

20651962939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1693900.

The product of its (nonzero) digits is 1574640, while the sum is 52.

The spelling of 20651962939 in words is "twenty billion, six hundred fifty-one million, nine hundred sixty-two thousand, nine hundred thirty-nine".