20220974817978 has 32 divisors (see below), whose sum is σ = 44118707369472. Its totient is φ = 6127538007600.

The previous prime is 20220974817971. The next prime is 20220974818043. The reversal of 20220974817978 is 87971847902202.

It is a Harshad number since it is a multiple of its sum of digits (66).

It is not an unprimeable number, because it can be changed into a prime (20220974817971) 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, 15372675 + ... + 16636137.

It is an arithmetic number, because the mean of its divisors is an integer number (1378709605296).

Almost surely, 2^{20220974817978} is an apocalyptic number.

20220974817978 is an abundant number, since it is smaller than the sum of its proper divisors (23897732551494).

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

20220974817978 is a wasteful number, since it uses less digits than its factorization.

20220974817978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1505970.

The product of its (nonzero) digits is 56899584, while the sum is 66.

The spelling of 20220974817978 in words is "twenty trillion, two hundred twenty billion, nine hundred seventy-four million, eight hundred seventeen thousand, nine hundred seventy-eight".