20973620 has 12 divisors (see below), whose sum is σ = 44044644. Its totient is φ = 8389440.

The previous prime is 20973607. The next prime is 20973643. The reversal of 20973620 is 2637902.

It can be written as a sum of positive squares in 2 ways, for example, as 15194404 + 5779216 = 3898^2 + 2404^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 524321 + ... + 524360.

It is an arithmetic number, because the mean of its divisors is an integer number (3670387).

Almost surely, 2^20973620 is an apocalyptic number.

20973620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20973620 is an abundant number, since it is smaller than the sum of its proper divisors (23071024).

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

20973620 is a wasteful number, since it uses less digits than its factorization.

20973620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1048690 (or 1048688 counting only the distinct ones).

The product of its (nonzero) digits is 4536, while the sum is 29.

The square root of 20973620 is about 4579.6964964941. The cubic root of 20973620 is about 275.7768447549.

The spelling of 20973620 in words is "twenty million, nine hundred seventy-three thousand, six hundred twenty".