20861457276 has 48 divisors (see below), whose sum is σ = 53118132480. Its totient is φ = 6319720320.

The previous prime is 20861457257. The next prime is 20861457277. The reversal of 20861457276 is 67275416802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20861457277) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 443160 + ... + 487968.

It is an arithmetic number, because the mean of its divisors is an integer number (1106627760).

Almost surely, 2^20861457276 is an apocalyptic number.

It is an amenable number.

20861457276 is an abundant number, since it is smaller than the sum of its proper divisors (32256675204).

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

20861457276 is a wasteful number, since it uses less digits than its factorization.

20861457276 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48354 (or 48352 counting only the distinct ones).

The product of its (nonzero) digits is 1128960, while the sum is 48.

The spelling of 20861457276 in words is "twenty billion, eight hundred sixty-one million, four hundred fifty-seven thousand, two hundred seventy-six".