20919159825 has 24 divisors (see below), whose sum is σ = 34590792000. Its totient is φ = 11155450560.

The previous prime is 20919159791. The next prime is 20919159853. The reversal of 20919159825 is 52895191902.

It is a happy number.

It is not a de Polignac number, because 20919159825 - 2⁷ = 20919159697 is a prime.

It is a super-2 number, since 2×20919159825² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 842691 + ... + 867159.

It is an arithmetic number, because the mean of its divisors is an integer number (1441283000).

Almost surely, 2^20919159825 is an apocalyptic number.

20919159825 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20919159825 is a deficient number, since it is larger than the sum of its proper divisors (13671632175).

20919159825 is a wasteful number, since it uses less digits than its factorization.

20919159825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35881 (or 35876 counting only the distinct ones).

The product of its (nonzero) digits is 583200, while the sum is 51.

The spelling of 20919159825 in words is "twenty billion, nine hundred nineteen million, one hundred fifty-nine thousand, eight hundred twenty-five".