20783425 has 12 divisors (see below), whose sum is σ = 27754300. Its totient is φ = 15347520.

The previous prime is 20783407. The next prime is 20783437. The reversal of 20783425 is 52438702.

It can be written as a sum of positive squares in 6 ways, for example, as 1034289 + 19749136 = 1017^2 + 4444^2 .

It is not a de Polignac number, because 20783425 - 2⁵ = 20783393 is a prime.

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, 31650 + ... + 32299.

Almost surely, 2^20783425 is an apocalyptic number.

20783425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20783425 is a deficient number, since it is larger than the sum of its proper divisors (6970875).

20783425 is a wasteful number, since it uses less digits than its factorization.

20783425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63972 (or 63967 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 31.

The square root of 20783425 is about 4558.8841836572. The cubic root of 20783425 is about 274.9407034686.

The spelling of 20783425 in words is "twenty million, seven hundred eighty-three thousand, four hundred twenty-five".