20477040040 has 16 divisors (see below), whose sum is σ = 46073340180. Its totient is φ = 8190816000.

The previous prime is 20477039977. The next prime is 20477040061. The reversal of 20477040040 is 4004077402.

It can be written as a sum of positive squares in 2 ways, for example, as 19761049476 + 715990564 = 140574^2 + 26758^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20477039990 and 20477040008.

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, 255962961 + ... + 255963040.

Almost surely, 2^20477040040 is an apocalyptic number.

20477040040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20477040040 is an abundant number, since it is smaller than the sum of its proper divisors (25596300140).

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

20477040040 is a wasteful number, since it uses less digits than its factorization.

20477040040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 511926012 (or 511926008 counting only the distinct ones).

The product of its (nonzero) digits is 6272, while the sum is 28.

The spelling of 20477040040 in words is "twenty billion, four hundred seventy-seven million, forty thousand, forty".