20770642 has 8 divisors (see below), whose sum is σ = 31506300. Its totient is φ = 10268544.

The previous prime is 20770637. The next prime is 20770657. The reversal of 20770642 is 24607702.

It can be written as a sum of positive squares in 2 ways, for example, as 20421361 + 349281 = 4519^2 + 591^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 20770642.

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, 58167 + ... + 58522.

Almost surely, 2^20770642 is an apocalyptic number.

20770642 is a deficient number, since it is larger than the sum of its proper divisors (10735658).

20770642 is a wasteful number, since it uses less digits than its factorization.

20770642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116780.

The product of its (nonzero) digits is 4704, while the sum is 28.

The square root of 20770642 is about 4557.4819802167. The cubic root of 20770642 is about 274.8843238005.

It can be divided in two parts, 20770 and 642, that added together give a palindrome (21412).

The spelling of 20770642 in words is "twenty million, seven hundred seventy thousand, six hundred forty-two".