20977370 has 16 divisors (see below), whose sum is σ = 37820520. Its totient is φ = 8377344.

The previous prime is 20977367. The next prime is 20977381. The reversal of 20977370 is 7377902.

It can be written as a sum of positive squares in 4 ways, for example, as 20187049 + 790321 = 4493^2 + 889^2 .

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20977370.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6794 + ... + 9386.

Almost surely, 2^20977370 is an apocalyptic number.

20977370 is a deficient number, since it is larger than the sum of its proper divisors (16843150).

20977370 is a wasteful number, since it uses less digits than its factorization.

20977370 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3409.

The product of its (nonzero) digits is 18522, while the sum is 35.

The square root of 20977370 is about 4580.1058939723. The cubic root of 20977370 is about 275.7932797105.

The spelling of 20977370 in words is "twenty million, nine hundred seventy-seven thousand, three hundred seventy".