20949083540 has 48 divisors (see below), whose sum is σ = 54848513664. Its totient is φ = 6529584000.

The previous prime is 20949083503. The next prime is 20949083549. The reversal of 20949083540 is 4538094902.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is a junction number, because it is equal to n+sod(n) for n = 20949083491 and 20949083500.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20949083549) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6800111 + ... + 6803190.

It is an arithmetic number, because the mean of its divisors is an integer number (1142677368).

Almost surely, 2^20949083540 is an apocalyptic number.

20949083540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20949083540 is an abundant number, since it is smaller than the sum of its proper divisors (33899430124).

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

20949083540 is a wasteful number, since it uses less digits than its factorization.

20949083540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13603328 (or 13603326 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 44.

The spelling of 20949083540 in words is "twenty billion, nine hundred forty-nine million, eighty-three thousand, five hundred forty".