420920525 has 12 divisors (see below), whose sum is σ = 523597812. Its totient is φ = 335667840.

The previous prime is 420920519. The next prime is 420920537. The reversal of 420920525 is 525029024.

It can be written as a sum of positive squares in 6 ways, for example, as 68194564 + 352725961 = 8258^2 + 18781^2 .

It is not a de Polignac number, because 420920525 - 2¹⁰ = 420919501 is a prime.

It is a hoax number, since the sum of its digits (29) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a Curzon 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, 18632 + ... + 34481.

It is an arithmetic number, because the mean of its divisors is an integer number (43633151).

Almost surely, 2^420920525 is an apocalyptic number.

It is an amenable number.

420920525 is a deficient number, since it is larger than the sum of its proper divisors (102677287).

420920525 is a wasteful number, since it uses less digits than its factorization.

420920525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53440 (or 53435 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 29.

The square root of 420920525 is about 20516.3477500261. The cubic root of 420920525 is about 749.4339580881.

Adding to 420920525 its reverse (525029024), we get a palindrome (945949549).

The spelling of 420920525 in words is "four hundred twenty million, nine hundred twenty thousand, five hundred twenty-five".