20920420 has 24 divisors (see below), whose sum is σ = 44062200. Its totient is φ = 8343552.

The previous prime is 20920411. The next prime is 20920441. The reversal of 20920420 is 2402902.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 272484 + 20647936 = 522^2 + 4544^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6436 + ... + 9124.

It is an arithmetic number, because the mean of its divisors is an integer number (1835925).

Almost surely, 2^20920420 is an apocalyptic number.

20920420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20920420 is an abundant number, since it is smaller than the sum of its proper divisors (23141780).

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

20920420 is a wasteful number, since it uses less digits than its factorization.

20920420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3087 (or 3085 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 20920420 is about 4573.8845634756. The cubic root of 20920420 is about 275.5434761971.

The spelling of 20920420 in words is "twenty million, nine hundred twenty thousand, four hundred twenty".