20978711370 has 32 divisors (see below), whose sum is σ = 55943231040. Its totient is φ = 5594322960.

The previous prime is 20978711333. The next prime is 20978711431. The reversal of 20978711370 is 7311787902.

20978711370 is a `hidden beast` number, since 209 + 7 + 8 + 71 + 1 + 370 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38849196 + ... + 38849735.

It is an arithmetic number, because the mean of its divisors is an integer number (1748225970).

Almost surely, 2^20978711370 is an apocalyptic number.

20978711370 is an abundant number, since it is smaller than the sum of its proper divisors (34964519670).

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

20978711370 is a wasteful number, since it uses less digits than its factorization.

20978711370 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77698947 (or 77698941 counting only the distinct ones).

The product of its (nonzero) digits is 148176, while the sum is 45.

The spelling of 20978711370 in words is "twenty billion, nine hundred seventy-eight million, seven hundred eleven thousand, three hundred seventy".