20774891786 has 32 divisors (see below), whose sum is σ = 36005860800. Its totient is φ = 8884972800.

The previous prime is 20774891777. The next prime is 20774891827. The reversal of 20774891786 is 68719847702.

It is a super-2 number, since 2×20774891786² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1695221 + ... + 1707431.

It is an arithmetic number, because the mean of its divisors is an integer number (1125183150).

Almost surely, 2^20774891786 is an apocalyptic number.

20774891786 is a deficient number, since it is larger than the sum of its proper divisors (15230969014).

20774891786 is a wasteful number, since it uses less digits than its factorization.

20774891786 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16790.

The product of its (nonzero) digits is 9483264, while the sum is 59.

The spelling of 20774891786 in words is "twenty billion, seven hundred seventy-four million, eight hundred ninety-one thousand, seven hundred eighty-six".