20055661815 has 32 divisors (see below), whose sum is σ = 36865253376. Its totient is φ = 9120291840.

The previous prime is 20055661811. The next prime is 20055661849. The reversal of 20055661815 is 51816655002.

It is not a de Polignac number, because 20055661815 - 2² = 20055661811 is a prime.

20055661815 is a modest number, since divided by 661815 gives 20055 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20055661811) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 479962 + ... + 520071.

It is an arithmetic number, because the mean of its divisors is an integer number (1152039168).

Almost surely, 2^20055661815 is an apocalyptic number.

20055661815 is a deficient number, since it is larger than the sum of its proper divisors (16809591561).

20055661815 is a wasteful number, since it uses less digits than its factorization.

20055661815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1000239.

The product of its (nonzero) digits is 72000, while the sum is 39.

The spelling of 20055661815 in words is "twenty billion, fifty-five million, six hundred sixty-one thousand, eight hundred fifteen".