20115011400 has 96 divisors (see below), whose sum is σ = 68025333600. Its totient is φ = 4876364800.

The previous prime is 20115011383. The next prime is 20115011431. The reversal of 20115011400 is 411051102.

It is a happy number.

It is a super-2 number, since 2×20115011400² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 20115011400.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1517265 + ... + 1530464.

It is an arithmetic number, because the mean of its divisors is an integer number (708597225).

Almost surely, 2^20115011400 is an apocalyptic number.

20115011400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20115011400 is an abundant number, since it is smaller than the sum of its proper divisors (47910322200).

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

20115011400 is a wasteful number, since it uses less digits than its factorization.

20115011400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3047759 (or 3047750 counting only the distinct ones).

The product of its (nonzero) digits is 40, while the sum is 15.

Adding to 20115011400 its reverse (411051102), we get a palindrome (20526062502).

The spelling of 20115011400 in words is "twenty billion, one hundred fifteen million, eleven thousand, four hundred".