20552155240 has 32 divisors (see below), whose sum is σ = 46651583880. Its totient is φ = 8148109312.

The previous prime is 20552155223. The next prime is 20552155249. The reversal of 20552155240 is 4255125502.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 16937981316 + 3614173924 = 130146^2 + 60118^2 .

It is not an unprimeable number, because it can be changed into a prime (20552155249) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2268949 + ... + 2277988.

Almost surely, 2^20552155240 is an apocalyptic number.

20552155240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20552155240 is an abundant number, since it is smaller than the sum of its proper divisors (26099428640).

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

20552155240 is a wasteful number, since it uses less digits than its factorization.

20552155240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4547061 (or 4547057 counting only the distinct ones).

The product of its (nonzero) digits is 20000, while the sum is 31.

The spelling of 20552155240 in words is "twenty billion, five hundred fifty-two million, one hundred fifty-five thousand, two hundred forty".