20774155240 has 64 divisors (see below), whose sum is σ = 48274652160. Its totient is φ = 8037442560.

The previous prime is 20774155231. The next prime is 20774155277. The reversal of 20774155240 is 4255147702.

It is a self number, because there is not a number n which added to its sum of digits gives 20774155240.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3589389 + ... + 3595171.

It is an arithmetic number, because the mean of its divisors is an integer number (754291440).

Almost surely, 2^20774155240 is an apocalyptic number.

20774155240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20774155240 is an abundant number, since it is smaller than the sum of its proper divisors (27500496920).

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

20774155240 is a wasteful number, since it uses less digits than its factorization.

20774155240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8722 (or 8718 counting only the distinct ones).

The product of its (nonzero) digits is 78400, while the sum is 37.

The spelling of 20774155240 in words is "twenty billion, seven hundred seventy-four million, one hundred fifty-five thousand, two hundred forty".