20635126778 has 16 divisors (see below), whose sum is σ = 35376967104. Its totient is φ = 8843009760.

The previous prime is 20635126753. The next prime is 20635126861. The reversal of 20635126778 is 87762153602.

It is a super-3 number, since 3×20635126778³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 198893 + ... + 284303.

It is an arithmetic number, because the mean of its divisors is an integer number (2211060444).

Almost surely, 2^20635126778 is an apocalyptic number.

20635126778 is a deficient number, since it is larger than the sum of its proper divisors (14741840326).

20635126778 is a wasteful number, since it uses less digits than its factorization.

20635126778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102677.

The product of its (nonzero) digits is 846720, while the sum is 47.

The spelling of 20635126778 in words is "twenty billion, six hundred thirty-five million, one hundred twenty-six thousand, seven hundred seventy-eight".