20434947900 has 72 divisors (see below), whose sum is σ = 59425415280. Its totient is φ = 5421642240.

The previous prime is 20434947851. The next prime is 20434947901. The reversal of 20434947900 is 974943402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20434947901) 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, 113785 + ... + 231984.

It is an arithmetic number, because the mean of its divisors is an integer number (825352990).

Almost surely, 2^20434947900 is an apocalyptic number.

20434947900 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20434947900 is an abundant number, since it is smaller than the sum of its proper divisors (38990467380).

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

20434947900 is a wasteful number, since it uses less digits than its factorization.

20434947900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 345983 (or 345976 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 42.

The spelling of 20434947900 in words is "twenty billion, four hundred thirty-four million, nine hundred forty-seven thousand, nine hundred".