820120554 has 24 divisors (see below), whose sum is σ = 1938467232. Its totient is φ = 248521320.

The previous prime is 820120549. The next prime is 820120559. The reversal of 820120554 is 455021028.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (820120549) and next prime (820120559).

It is not an unprimeable number, because it can be changed into a prime (820120559) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2070814 + ... + 2071209.

It is an arithmetic number, because the mean of its divisors is an integer number (80769468).

Almost surely, 2^820120554 is an apocalyptic number.

820120554 is an abundant number, since it is smaller than the sum of its proper divisors (1118346678).

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

820120554 is a wasteful number, since it uses less digits than its factorization.

820120554 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4142042 (or 4142039 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 27.

The square root of 820120554 is about 28637.7470133389. The cubic root of 820120554 is about 936.0360289112.

The spelling of 820120554 in words is "eight hundred twenty million, one hundred twenty thousand, five hundred fifty-four".