20895813988 has 24 divisors (see below), whose sum is σ = 41975744832. Its totient is φ = 8915895264.

The previous prime is 20895813979. The next prime is 20895814013. The reversal of 20895813988 is 88931859802.

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 7 ways as a sum of consecutive naturals, for example, 1637431 + ... + 1650142.

It is an arithmetic number, because the mean of its divisors is an integer number (1748989368).

Almost surely, 2^20895813988 is an apocalyptic number.

20895813988 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

20895813988 is an abundant number, since it is smaller than the sum of its proper divisors (21079930844).

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

20895813988 is a wasteful number, since it uses less digits than its factorization.

20895813988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3287811 (or 3287809 counting only the distinct ones).

The product of its (nonzero) digits is 9953280, while the sum is 61.

The spelling of 20895813988 in words is "twenty billion, eight hundred ninety-five million, eight hundred thirteen thousand, nine hundred eighty-eight".