20440177420 has 48 divisors (see below), whose sum is σ = 46243810368. Its totient is φ = 7544275200.

The previous prime is 20440177403. The next prime is 20440177427. The reversal of 20440177420 is 2477104402.

It is a super-2 number, since 2×20440177420² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20440177427) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 744945 + ... + 771895.

It is an arithmetic number, because the mean of its divisors is an integer number (963412716).

Almost surely, 2^20440177420 is an apocalyptic number.

20440177420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20440177420 is an abundant number, since it is smaller than the sum of its proper divisors (25803632948).

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

20440177420 is a wasteful number, since it uses less digits than its factorization.

20440177420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29890 (or 29888 counting only the distinct ones).

The product of its (nonzero) digits is 12544, while the sum is 31.

The spelling of 20440177420 in words is "twenty billion, four hundred forty million, one hundred seventy-seven thousand, four hundred twenty".