20772006440 has 16 divisors (see below), whose sum is σ = 46737014580. Its totient is φ = 8308802560.

The previous prime is 20772006439. The next prime is 20772006457. The reversal of 20772006440 is 4460027702.

It can be written as a sum of positive squares in 2 ways, for example, as 20722754116 + 49252324 = 143954^2 + 7018^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20772006397 and 20772006406.

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, 259650041 + ... + 259650120.

Almost surely, 2^20772006440 is an apocalyptic number.

20772006440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20772006440 is an abundant number, since it is smaller than the sum of its proper divisors (25965008140).

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

20772006440 is a wasteful number, since it uses less digits than its factorization.

20772006440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 519300172 (or 519300168 counting only the distinct ones).

The product of its (nonzero) digits is 18816, while the sum is 32.

The spelling of 20772006440 in words is "twenty billion, seven hundred seventy-two million, six thousand, four hundred forty".