20447240077 has 8 divisors (see below), whose sum is σ = 22671754272. Its totient is φ = 18283671600.

The previous prime is 20447240063. The next prime is 20447240101. The reversal of 20447240077 is 77004274402.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20447240077 - 2¹⁵ = 20447207309 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20447240677) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15235723 + ... + 15237064.

It is an arithmetic number, because the mean of its divisors is an integer number (2833969284).

Almost surely, 2^20447240077 is an apocalyptic number.

It is an amenable number.

20447240077 is a deficient number, since it is larger than the sum of its proper divisors (2224514195).

20447240077 is a wasteful number, since it uses less digits than its factorization.

20447240077 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30472859.

The product of its (nonzero) digits is 87808, while the sum is 37.

The spelling of 20447240077 in words is "twenty billion, four hundred forty-seven million, two hundred forty thousand, seventy-seven".