20833541640 has 96 divisors (see below), whose sum is σ = 68083306200. Its totient is φ = 5524899840.

The previous prime is 20833541551. The next prime is 20833541653. The reversal of 20833541640 is 4614533802.

20833541640 is a `hidden beast` number, since 2 + 0 + 8 + 3 + 3 + 5 + 4 + 1 + 640 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 4850008164 + 15983533476 = 69642^2 + 126426^2 .

It is a super-2 number, since 2×20833541640² (a number of 21 digits) contains 22 as substring.

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 = 20833541595 and 20833541604.

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, 94705 + ... + 225024.

Almost surely, 2^20833541640 is an apocalyptic number.

20833541640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20833541640 is an abundant number, since it is smaller than the sum of its proper divisors (47249764560).

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

20833541640 is a wasteful number, since it uses less digits than its factorization.

20833541640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 319927 (or 319920 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 36.

The spelling of 20833541640 in words is "twenty billion, eight hundred thirty-three million, five hundred forty-one thousand, six hundred forty".