20770664 has 8 divisors (see below), whose sum is σ = 38945010. Its totient is φ = 10385328.

The previous prime is 20770657. The next prime is 20770681. The reversal of 20770664 is 46607702.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 12602500 + 8168164 = 3550^2 + 2858^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 20770664.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1298159 + ... + 1298174.

Almost surely, 2^20770664 is an apocalyptic number.

It is an amenable number.

20770664 is a deficient number, since it is larger than the sum of its proper divisors (18174346).

20770664 is a wasteful number, since it uses less digits than its factorization.

20770664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2596339 (or 2596335 counting only the distinct ones).

The product of its (nonzero) digits is 14112, while the sum is 32.

The square root of 20770664 is about 4557.4843938296. The cubic root of 20770664 is about 274.8844208518.

The spelling of 20770664 in words is "twenty million, seven hundred seventy thousand, six hundred sixty-four".