20549400 has 96 divisors (see below), whose sum is σ = 65955600. Its totient is φ = 5286400.

The previous prime is 20549381. The next prime is 20549407. The reversal of 20549400 is 494502.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20549407) 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, 16810 + ... + 17990.

Almost surely, 2^20549400 is an apocalyptic number.

20549400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20549400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32977800).

20549400 is an abundant number, since it is smaller than the sum of its proper divisors (45406200).

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

20549400 is a wasteful number, since it uses less digits than its factorization.

20549400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1229 (or 1220 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 20549400 is about 4533.1446039146. The cubic root of 20549400 is about 273.9048455706.

The spelling of 20549400 in words is "twenty million, five hundred forty-nine thousand, four hundred".