20547900 has 162 divisors, whose sum is σ = 69283760. Its totient is φ = 5091840.

The previous prime is 20547887. The next prime is 20547931. The reversal of 20547900 is 974502.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 53 ways as a sum of consecutive naturals, for example, 260061 + ... + 260139.

Almost surely, 2^20547900 is an apocalyptic number.

20547900 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 20547900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34641880).

20547900 is an abundant number, since it is smaller than the sum of its proper divisors (48735860).

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

20547900 is a wasteful number, since it uses less digits than its factorization.

20547900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133 (or 106 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 27.

The square root of 20547900 is about 4532.9791528310. The cubic root of 20547900 is about 273.8981808624.

The spelling of 20547900 in words is "twenty million, five hundred forty-seven thousand, nine hundred".