20629778682 has 32 divisors (see below), whose sum is σ = 42437034432. Its totient is φ = 6680893824.

The previous prime is 20629778629. The next prime is 20629778683. The reversal of 20629778682 is 28687792602.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (20629778683) 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, 83598 + ... + 219654.

It is an arithmetic number, because the mean of its divisors is an integer number (1326157326).

Almost surely, 2^20629778682 is an apocalyptic number.

20629778682 is an abundant number, since it is smaller than the sum of its proper divisors (21807255750).

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

20629778682 is a wasteful number, since it uses less digits than its factorization.

20629778682 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136782.

The product of its (nonzero) digits is 8128512, while the sum is 57.

The spelling of 20629778682 in words is "twenty billion, six hundred twenty-nine million, seven hundred seventy-eight thousand, six hundred eighty-two".