20553798 has 16 divisors (see below), whose sum is σ = 41318640. Its totient is φ = 6816096.

The previous prime is 20553787. The next prime is 20553823. The reversal of 20553798 is 89735502.

It is a super-2 number, since 2×20553798² = 844917224449608, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7513 + ... + 9876.

It is an arithmetic number, because the mean of its divisors is an integer number (2582415).

Almost surely, 2^20553798 is an apocalyptic number.

20553798 is an abundant number, since it is smaller than the sum of its proper divisors (20764842).

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

20553798 is a wasteful number, since it uses less digits than its factorization.

20553798 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17591.

The product of its (nonzero) digits is 75600, while the sum is 39.

The square root of 20553798 is about 4533.6296716869. The cubic root of 20553798 is about 273.9243846258.

The spelling of 20553798 in words is "twenty million, five hundred fifty-three thousand, seven hundred ninety-eight".