20517047754 has 32 divisors (see below), whose sum is σ = 49654705536. Its totient is φ = 5517189120.

The previous prime is 20517047753. The next prime is 20517047773. The reversal of 20517047754 is 45774071502.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is not an unprimeable number, because it can be changed into a prime (20517047753) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14366967 + ... + 14368394.

It is an arithmetic number, because the mean of its divisors is an integer number (1551709548).

Almost surely, 2^20517047754 is an apocalyptic number.

20517047754 is an abundant number, since it is smaller than the sum of its proper divisors (29137657782).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20517047754 is a wasteful number, since it uses less digits than its factorization.

20517047754 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28735390.

The product of its (nonzero) digits is 274400, while the sum is 42.

The spelling of 20517047754 in words is "twenty billion, five hundred seventeen million, forty-seven thousand, seven hundred fifty-four".