20770641 has 32 divisors (see below), whose sum is σ = 32659200. Its totient is φ = 13023360.

The previous prime is 20770637. The next prime is 20770657. The reversal of 20770641 is 14607702.

It is not a de Polignac number, because 20770641 - 2² = 20770637 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (20770681) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 31780 + ... + 32426.

It is an arithmetic number, because the mean of its divisors is an integer number (1020600).

Almost surely, 2^20770641 is an apocalyptic number.

It is an amenable number.

20770641 is a deficient number, since it is larger than the sum of its proper divisors (11888559).

20770641 is a wasteful number, since it uses less digits than its factorization.

20770641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 726 (or 720 counting only the distinct ones).

The product of its (nonzero) digits is 2352, while the sum is 27.

The square root of 20770641 is about 4557.4818705070. The cubic root of 20770641 is about 274.8843193891.

It can be divided in two parts, 20 and 770641, that added together give a triangular number (770661 = T₁₂₄₁).

The spelling of 20770641 in words is "twenty million, seven hundred seventy thousand, six hundred forty-one".