20642241228 has 48 divisors (see below), whose sum is σ = 58283979264. Its totient is φ = 5550854400.

The previous prime is 20642241127. The next prime is 20642241229. The reversal of 20642241228 is 82214224602.

It is a super-2 number, since 2×20642241228² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20642241229) 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, 7226248 + ... + 7229103.

It is an arithmetic number, because the mean of its divisors is an integer number (1214249568).

Almost surely, 2^20642241228 is an apocalyptic number.

20642241228 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

20642241228 is an abundant number, since it is smaller than the sum of its proper divisors (37641738036).

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

20642241228 is a wasteful number, since it uses less digits than its factorization.

20642241228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14455382 (or 14455380 counting only the distinct ones).

The product of its (nonzero) digits is 24576, while the sum is 33.

The spelling of 20642241228 in words is "twenty billion, six hundred forty-two million, two hundred forty-one thousand, two hundred twenty-eight".