20828425 has 12 divisors (see below), whose sum is σ = 25941916. Its totient is φ = 16588800.

The previous prime is 20828419. The next prime is 20828449. The reversal of 20828425 is 52482802.

It can be written as a sum of positive squares in 6 ways, for example, as 2347024 + 18481401 = 1532^2 + 4299^2 .

It is not a de Polignac number, because 20828425 - 2⁵ = 20828393 is a prime.

It is a hoax number, since the sum of its digits (31) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4297 + ... + 7753.

Almost surely, 2^20828425 is an apocalyptic number.

20828425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20828425 is a deficient number, since it is larger than the sum of its proper divisors (5113491).

20828425 is a wasteful number, since it uses less digits than its factorization.

20828425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3708 (or 3703 counting only the distinct ones).

The product of its (nonzero) digits is 10240, while the sum is 31.

The square root of 20828425 is about 4563.8169332260. The cubic root of 20828425 is about 275.1389930978.

The spelling of 20828425 in words is "twenty million, eight hundred twenty-eight thousand, four hundred twenty-five".