20787540959976 has 64 divisors (see below), whose sum is σ = 59691431424000. Its totient is φ = 5909451691968.

The previous prime is 20787540959971. The next prime is 20787540959981. The reversal of 20787540959976 is 67995904578702.

It is an interprime number because it is at equal distance from previous prime (20787540959971) and next prime (20787540959981).

It is a Smith number, since the sum of its digits (78) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (20787540959971) 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, 310859440 + ... + 310926303.

It is an arithmetic number, because the mean of its divisors is an integer number (932678616000).

Almost surely, 2^{20787540959976} is an apocalyptic number.

It is an amenable number.

20787540959976 is an abundant number, since it is smaller than the sum of its proper divisors (38903890464024).

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

20787540959976 is a wasteful number, since it uses less digits than its factorization.

20787540959976 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 621785958 (or 621785954 counting only the distinct ones).

The product of its (nonzero) digits is 2400451200, while the sum is 78.

The spelling of 20787540959976 in words is "twenty trillion, seven hundred eighty-seven billion, five hundred forty million, nine hundred fifty-nine thousand, nine hundred seventy-six".