20477900 has 36 divisors (see below), whose sum is σ = 45392928. Its totient is φ = 8015040.

The previous prime is 20477893. The next prime is 20477903. The reversal of 20477900 is 977402.

It is not an unprimeable number, because it can be changed into a prime (20477903) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2522 + ... + 6878.

Almost surely, 2^20477900 is an apocalyptic number.

20477900 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 20477900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22696464).

20477900 is an abundant number, since it is smaller than the sum of its proper divisors (24915028).

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

20477900 is a wasteful number, since it uses less digits than its factorization.

20477900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4418 (or 4411 counting only the distinct ones).

The product of its (nonzero) digits is 3528, while the sum is 29.

The square root of 20477900 is about 4525.2513742333. The cubic root of 20477900 is about 273.5867997177.

The spelling of 20477900 in words is "twenty million, four hundred seventy-seven thousand, nine hundred".