20402783632 has 80 divisors (see below), whose sum is σ = 49358840832. Its totient is φ = 7937170560.

The previous prime is 20402783617. The next prime is 20402783683. The reversal of 20402783632 is 23638720402.

It is a super-2 number, since 2×20402783632² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20402783591 and 20402783600.

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, 829333 + ... + 853579.

Almost surely, 2^20402783632 is an apocalyptic number.

20402783632 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20402783632, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24679420416).

20402783632 is an abundant number, since it is smaller than the sum of its proper divisors (28956057200).

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

20402783632 is a wasteful number, since it uses less digits than its factorization.

20402783632 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24956 (or 24950 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 37.

The spelling of 20402783632 in words is "twenty billion, four hundred two million, seven hundred eighty-three thousand, six hundred thirty-two".