20155154240 has 56 divisors (see below), whose sum is σ = 51686353320. Its totient is φ = 7441901568.

The previous prime is 20155154221. The next prime is 20155154249. The reversal of 20155154240 is 4245155102.

It can be written as a sum of positive squares in 4 ways, for example, as 72863296 + 20082290944 = 8536^2 + 141712^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20155154249) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2418335 + ... + 2426654.

It is an arithmetic number, because the mean of its divisors is an integer number (922970595).

Almost surely, 2^20155154240 is an apocalyptic number.

20155154240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20155154240 is an abundant number, since it is smaller than the sum of its proper divisors (31531199080).

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

20155154240 is a wasteful number, since it uses less digits than its factorization.

20155154240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4845019 (or 4845009 counting only the distinct ones).

The product of its (nonzero) digits is 8000, while the sum is 29.

The spelling of 20155154240 in words is "twenty billion, one hundred fifty-five million, one hundred fifty-four thousand, two hundred forty".