20770643 has 8 divisors (see below), whose sum is σ = 21052608. Its totient is φ = 20490624.

The previous prime is 20770637. The next prime is 20770657. The reversal of 20770643 is 34607702.

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

It is a cyclic number.

It is not a de Polignac number, because 20770643 - 2¹⁶ = 20705107 is a prime.

It is a super-2 number, since 2×20770643² = 862839221266898, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20700643) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44630 + ... + 45092.

It is an arithmetic number, because the mean of its divisors is an integer number (2631576).

Almost surely, 2^20770643 is an apocalyptic number.

20770643 is a deficient number, since it is larger than the sum of its proper divisors (281965).

20770643 is a wasteful number, since it uses less digits than its factorization.

20770643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 973.

The product of its (nonzero) digits is 7056, while the sum is 29.

The square root of 20770643 is about 4557.4820899264. The cubic root of 20770643 is about 274.8843282119.

The spelling of 20770643 in words is "twenty million, seven hundred seventy thousand, six hundred forty-three".