20295681228 has 36 divisors (see below), whose sum is σ = 51308016760. Its totient is φ = 6764561856.

The previous prime is 20295681221. The next prime is 20295681253. The reversal of 20295681228 is 82218659202.

It is a tau number, because it is divible by the number of its divisors (36).

It is not an unprimeable number, because it can be changed into a prime (20295681221) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 462003 + ... + 504021.

Almost surely, 2^20295681228 is an apocalyptic number.

It is an amenable number.

20295681228 is an abundant number, since it is smaller than the sum of its proper divisors (31012335532).

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

20295681228 is a wasteful number, since it uses less digits than its factorization.

20295681228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55446 (or 55441 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 45.

The spelling of 20295681228 in words is "twenty billion, two hundred ninety-five million, six hundred eighty-one thousand, two hundred twenty-eight".