20311765477 has 8 divisors (see below), whose sum is σ = 20904279264. Its totient is φ = 19724713008.

The previous prime is 20311765469. The next prime is 20311765483. The reversal of 20311765477 is 77456711302.

It is a happy number.

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

It is not a de Polignac number, because 20311765477 - 2³ = 20311765469 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20311765417) 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, 1357783 + ... + 1372660.

It is an arithmetic number, because the mean of its divisors is an integer number (2613034908).

Almost surely, 2^20311765477 is an apocalyptic number.

It is an amenable number.

20311765477 is a deficient number, since it is larger than the sum of its proper divisors (592513787).

20311765477 is a wasteful number, since it uses less digits than its factorization.

20311765477 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2730659.

The product of its (nonzero) digits is 246960, while the sum is 43.

The spelling of 20311765477 in words is "twenty billion, three hundred eleven million, seven hundred sixty-five thousand, four hundred seventy-seven".