20772420 has 24 divisors (see below), whose sum is σ = 58162944. Its totient is φ = 5539296.

The previous prime is 20772403. The next prime is 20772443. The reversal of 20772420 is 2427702.

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, 173044 + ... + 173163.

It is an arithmetic number, because the mean of its divisors is an integer number (2423456).

Almost surely, 2^20772420 is an apocalyptic number.

20772420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20772420 is an abundant number, since it is smaller than the sum of its proper divisors (37390524).

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

20772420 is a wasteful number, since it uses less digits than its factorization.

20772420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 346219 (or 346217 counting only the distinct ones).

The product of its (nonzero) digits is 1568, while the sum is 24.

The square root of 20772420 is about 4557.6770398965. The cubic root of 20772420 is about 274.8921670885.

It can be divided in two parts, 207 and 72420, that added together give a palindrome (72627).

The spelling of 20772420 in words is "twenty million, seven hundred seventy-two thousand, four hundred twenty".