20851517288476 has 12 divisors (see below), whose sum is σ = 41703034577008. Its totient is φ = 8936364552192.

The previous prime is 20851517288473. The next prime is 20851517288501. The reversal of 20851517288476 is 67488271515802.

20851517288476 is an admirable number.

It is a super-2 number, since 2×20851517288476² (a number of 27 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (64) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20851517288471) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 372348522981 + ... + 372348523036.

Almost surely, 2^{20851517288476} is an apocalyptic number.

It is an amenable number.

20851517288476 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

20851517288476 is a wasteful number, since it uses less digits than its factorization.

20851517288476 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 744697046028 (or 744697046026 counting only the distinct ones).

The product of its (nonzero) digits is 60211200, while the sum is 64.

The spelling of 20851517288476 in words is "twenty trillion, eight hundred fifty-one billion, five hundred seventeen million, two hundred eighty-eight thousand, four hundred seventy-six".