20649279090 has 32 divisors (see below), whose sum is σ = 54063567936. Its totient is φ = 5005885760.

The previous prime is 20649279071. The next prime is 20649279113. The reversal of 20649279090 is 9097294602.

It is a super-2 number, since 2×20649279090² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

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, 31286457 + ... + 31287116.

It is an arithmetic number, because the mean of its divisors is an integer number (1689486498).

Almost surely, 2^20649279090 is an apocalyptic number.

20649279090 is an abundant number, since it is smaller than the sum of its proper divisors (33414288846).

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

20649279090 is a wasteful number, since it uses less digits than its factorization.

20649279090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62573594.

The product of its (nonzero) digits is 489888, while the sum is 48.

It can be divided in two parts, 206492 and 79090, that added together give a palindrome (285582).

The spelling of 20649279090 in words is "twenty billion, six hundred forty-nine million, two hundred seventy-nine thousand, ninety".