20551470 has 64 divisors (see below), whose sum is σ = 53187840. Its totient is φ = 5063168.

The previous prime is 20551469. The next prime is 20551477. The reversal of 20551470 is 7415502.

It is a self number, because there is not a number n which added to its sum of digits gives 20551470.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20551477) 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, 29749 + ... + 30431.

It is an arithmetic number, because the mean of its divisors is an integer number (831060).

Almost surely, 2^20551470 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20551470, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26593920).

20551470 is an abundant number, since it is smaller than the sum of its proper divisors (32636370).

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

20551470 is a wasteful number, since it uses less digits than its factorization.

20551470 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 769.

The product of its (nonzero) digits is 1400, while the sum is 24.

The square root of 20551470 is about 4533.3729164939. The cubic root of 20551470 is about 273.9140423354.

Adding to 20551470 its reverse (7415502), we get a palindrome (27966972).

The spelling of 20551470 in words is "twenty million, five hundred fifty-one thousand, four hundred seventy".