20615555200 has 48 divisors (see below), whose sum is σ = 50926871610. Its totient is φ = 8246220800.

The previous prime is 20615555197. The next prime is 20615555203. The reversal of 20615555200 is 255551602.

It is an interprime number because it is at equal distance from previous prime (20615555197) and next prime (20615555203).

It can be written as a sum of positive squares in 3 ways, for example, as 17261755456 + 3353799744 = 131384^2 + 57912^2 .

It is a super-2 number, since 2×20615555200² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20615555203) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3217981 + ... + 3224380.

Almost surely, 2^20615555200 is an apocalyptic number.

20615555200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20615555200 is an abundant number, since it is smaller than the sum of its proper divisors (30311316410).

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

20615555200 is an equidigital number, since it uses as much as digits as its factorization.

20615555200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6442385 (or 6442368 counting only the distinct ones).

The product of its (nonzero) digits is 15000, while the sum is 31.

The spelling of 20615555200 in words is "twenty billion, six hundred fifteen million, five hundred fifty-five thousand, two hundred".