20501401377477 has 8 divisors (see below), whose sum is σ = 28073991075616. Its totient is φ = 13298206298832.

The previous prime is 20501401377449. The next prime is 20501401377493. The reversal of 20501401377477 is 77477310410502.

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

It is not a de Polignac number, because 20501401377477 - 2²² = 20501397183173 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 (20501401377427) 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, 92348654743 + ... + 92348654964.

It is an arithmetic number, because the mean of its divisors is an integer number (3509248884452).

Almost surely, 2^{20501401377477} is an apocalyptic number.

It is an amenable number.

20501401377477 is a deficient number, since it is larger than the sum of its proper divisors (7572589698139).

20501401377477 is a wasteful number, since it uses less digits than its factorization.

20501401377477 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 184697309747.

The product of its (nonzero) digits is 1152480, while the sum is 48.

Adding to 20501401377477 its reverse (77477310410502), we get a palindrome (97978711787979).

The spelling of 20501401377477 in words is "twenty trillion, five hundred one billion, four hundred one million, three hundred seventy-seven thousand, four hundred seventy-seven".