20399287032 has 96 divisors (see below), whose sum is σ = 57034177200. Its totient is φ = 6582739968.

The previous prime is 20399287019. The next prime is 20399287049. The reversal of 20399287032 is 23078299302.

It is a super-2 number, since 2×20399287032² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 320694 + ... + 379002.

Almost surely, 2^20399287032 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20399287032, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28517088600).

20399287032 is an abundant number, since it is smaller than the sum of its proper divisors (36634890168).

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

20399287032 is a wasteful number, since it uses less digits than its factorization.

20399287032 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58477 (or 58470 counting only the distinct ones).

The product of its (nonzero) digits is 326592, while the sum is 45.

The spelling of 20399287032 in words is "twenty billion, three hundred ninety-nine million, two hundred eighty-seven thousand, thirty-two".