20402270128 has 10 divisors (see below), whose sum is σ = 39529398404. Its totient is φ = 10201135056.

The previous prime is 20402270123. The next prime is 20402270183. The reversal of 20402270128 is 82107220402.

It is a super-2 number, since 2×20402270128² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20402270096 and 20402270105.

It is not an unprimeable number, because it can be changed into a prime (20402270123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 637570926 + ... + 637570957.

Almost surely, 2^20402270128 is an apocalyptic number.

It is an amenable number.

20402270128 is a deficient number, since it is larger than the sum of its proper divisors (19127128276).

20402270128 is a wasteful number, since it uses less digits than its factorization.

20402270128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1275141891 (or 1275141885 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 28.

The spelling of 20402270128 in words is "twenty billion, four hundred two million, two hundred seventy thousand, one hundred twenty-eight".