20555010 has 144 divisors (see below), whose sum is σ = 64022400. Its totient is φ = 4560192.

The previous prime is 20555009. The next prime is 20555071. The reversal of 20555010 is 1055502.

20555010 = 561² + 562² + ... + 619².

It is a super-2 number, since 2×20555010² = 845016872200200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 260151 + ... + 260229.

It is an arithmetic number, because the mean of its divisors is an integer number (444600).

Almost surely, 2^20555010 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20555010, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32011200).

20555010 is an abundant number, since it is smaller than the sum of its proper divisors (43467390).

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

20555010 is a wasteful number, since it uses less digits than its factorization.

20555010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165 (or 155 counting only the distinct ones).

The product of its (nonzero) digits is 250, while the sum is 18.

The square root of 20555010 is about 4533.7633374494. The cubic root of 20555010 is about 273.9297687050.

The spelling of 20555010 in words is "twenty million, five hundred fifty-five thousand, ten".