20926401840 has 120 divisors (see below), whose sum is σ = 72880783248. Its totient is φ = 5580368640.

The previous prime is 20926401803. The next prime is 20926401901. The reversal of 20926401840 is 4810462902.

20926401840 is a `hidden beast` number, since 2 + 0 + 9 + 2 + 640 + 1 + 8 + 4 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (120).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 20926401795 and 20926401804.

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 23 ways as a sum of consecutive naturals, for example, 518791 + ... + 557670.

Almost surely, 2^20926401840 is an apocalyptic number.

20926401840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20926401840 is an abundant number, since it is smaller than the sum of its proper divisors (51954381408).

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

20926401840 is a wasteful number, since it uses less digits than its factorization.

20926401840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1076489 (or 1076471 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 36.

The spelling of 20926401840 in words is "twenty billion, nine hundred twenty-six million, four hundred one thousand, eight hundred forty".