20437422977 has 4 divisors (see below), whose sum is σ = 20454217476. Its totient is φ = 20420628480.

The previous prime is 20437422931. The next prime is 20437422991. The reversal of 20437422977 is 77922473402.

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

It can be written as a sum of positive squares in 2 ways, for example, as 5672499856 + 14764923121 = 75316^2 + 121511^2 .

It is a cyclic number.

It is not a de Polignac number, because 20437422977 - 2⁸ = 20437422721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20437422077) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8395424 + ... + 8397857.

It is an arithmetic number, because the mean of its divisors is an integer number (5113554369).

Almost surely, 2^20437422977 is an apocalyptic number.

It is an amenable number.

20437422977 is a deficient number, since it is larger than the sum of its proper divisors (16794499).

20437422977 is a wasteful number, since it uses less digits than its factorization.

20437422977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16794498.

The product of its (nonzero) digits is 1185408, while the sum is 47.

The spelling of 20437422977 in words is "twenty billion, four hundred thirty-seven million, four hundred twenty-two thousand, nine hundred seventy-seven".