20205401544 has 48 divisors (see below), whose sum is σ = 57941963820. Its totient is φ = 6338949120.

The previous prime is 20205401543. The next prime is 20205401563. The reversal of 20205401544 is 44510450202.

20205401544 is a `hidden beast` number, since 2 + 0 + 205 + 401 + 54 + 4 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 17463622500 + 2741779044 = 132150^2 + 52362^2 .

It is not an unprimeable number, because it can be changed into a prime (20205401543) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8252617 + ... + 8255064.

Almost surely, 2^20205401544 is an apocalyptic number.

20205401544 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

20205401544 is an abundant number, since it is smaller than the sum of its proper divisors (37736562276).

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

20205401544 is a wasteful number, since it uses less digits than its factorization.

20205401544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16507710 (or 16507703 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 27.

Adding to 20205401544 its reverse (44510450202), we get a palindrome (64715851746).

It can be divided in two parts, 2020540 and 1544, that added together give a square (2022084 = 1422²).

The spelling of 20205401544 in words is "twenty billion, two hundred five million, four hundred one thousand, five hundred forty-four".