20946851540 has 48 divisors (see below), whose sum is σ = 44157469440. Its totient is φ = 8346602880.

The previous prime is 20946851539. The next prime is 20946851557. The reversal of 20946851540 is 4515864902.

It is a junction number, because it is equal to n+sod(n) for n = 20946851491 and 20946851500.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6841610 + ... + 6844670.

It is an arithmetic number, because the mean of its divisors is an integer number (919947280).

Almost surely, 2^20946851540 is an apocalyptic number.

20946851540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20946851540 is an abundant number, since it is smaller than the sum of its proper divisors (23210617900).

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

20946851540 is a wasteful number, since it uses less digits than its factorization.

20946851540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4272 (or 4270 counting only the distinct ones).

The product of its (nonzero) digits is 345600, while the sum is 44.

The spelling of 20946851540 in words is "twenty billion, nine hundred forty-six million, eight hundred fifty-one thousand, five hundred forty".