20219550 has 48 divisors (see below), whose sum is σ = 54006960. Its totient is φ = 4976640.

The previous prime is 20219539. The next prime is 20219557. The reversal of 20219550 is 5591202.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20219550.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20219557) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3235 + ... + 7134.

It is an arithmetic number, because the mean of its divisors is an integer number (1125145).

Almost surely, 2^20219550 is an apocalyptic number.

20219550 is an abundant number, since it is smaller than the sum of its proper divisors (33787410).

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

20219550 is a wasteful number, since it uses less digits than its factorization.

20219550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10397 (or 10392 counting only the distinct ones).

The product of its (nonzero) digits is 900, while the sum is 24.

The square root of 20219550 is about 4496.6153938268. The cubic root of 20219550 is about 272.4313998403.

The spelling of 20219550 in words is "twenty million, two hundred nineteen thousand, five hundred fifty".