20407405236 has 12 divisors (see below), whose sum is σ = 47617278912. Its totient is φ = 6802468408.

The previous prime is 20407405219. The next prime is 20407405283. The reversal of 20407405236 is 63250470402.

It is a tau number, because it is divible by the number of its divisors (12).

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 20407405197 and 20407405206.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 850308540 + ... + 850308563.

It is an arithmetic number, because the mean of its divisors is an integer number (3968106576).

Almost surely, 2^20407405236 is an apocalyptic number.

It is an amenable number.

20407405236 is an abundant number, since it is smaller than the sum of its proper divisors (27209873676).

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

20407405236 is a wasteful number, since it uses less digits than its factorization.

20407405236 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1700617110 (or 1700617108 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 33.

Adding to 20407405236 its reverse (63250470402), we get a palindrome (83657875638).

The spelling of 20407405236 in words is "twenty billion, four hundred seven million, four hundred five thousand, two hundred thirty-six".