20280432 has 40 divisors (see below), whose sum is σ = 52563600. Its totient is φ = 6737920.

The previous prime is 20280419. The next prime is 20280433. The reversal of 20280432 is 23408202.

It is a super-2 number, since 2×20280432² = 822591844213248, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20280399 and 20280408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20280433) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21082 + ... + 22022.

It is an arithmetic number, because the mean of its divisors is an integer number (1314090).

Almost surely, 2^20280432 is an apocalyptic number.

It is an amenable number.

20280432 is an abundant number, since it is smaller than the sum of its proper divisors (32283168).

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

20280432 is a wasteful number, since it uses less digits than its factorization.

20280432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1401 (or 1395 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 21.

The square root of 20280432 is about 4503.3800639076. The cubic root of 20280432 is about 272.7045603712.

Adding to 20280432 its reverse (23408202), we get a palindrome (43688634).

The spelling of 20280432 in words is "twenty million, two hundred eighty thousand, four hundred thirty-two".