20650205400 has 96 divisors (see below), whose sum is σ = 69835262400. Its totient is φ = 5006108800.

The previous prime is 20650205399. The next prime is 20650205417. The reversal of 20650205400 is 450205602.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1557810 + ... + 1571009.

It is an arithmetic number, because the mean of its divisors is an integer number (727450650).

Almost surely, 2^20650205400 is an apocalyptic number.

20650205400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20650205400 is an abundant number, since it is smaller than the sum of its proper divisors (49185057000).

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

20650205400 is a wasteful number, since it uses less digits than its factorization.

20650205400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3128849 (or 3128840 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 24.

The spelling of 20650205400 in words is "twenty billion, six hundred fifty million, two hundred five thousand, four hundred".