20420232400 has 30 divisors (see below), whose sum is σ = 49059609302. Its totient is φ = 8168092800.

The previous prime is 20420232389. The next prime is 20420232421. The reversal of 20420232400 is 423202402.

It can be written as a sum of positive squares in 3 ways, for example, as 4586540176 + 15833692224 = 67724^2 + 125832^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 25524891 + ... + 25525690.

Almost surely, 2^20420232400 is an apocalyptic number.

20420232400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20420232400 is an abundant number, since it is smaller than the sum of its proper divisors (28639376902).

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

20420232400 is a wasteful number, since it uses less digits than its factorization.

20420232400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51050599 (or 51050588 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 19.

Adding to 20420232400 its reverse (423202402), we get a palindrome (20843434802).

The spelling of 20420232400 in words is "twenty billion, four hundred twenty million, two hundred thirty-two thousand, four hundred".