20670988 has 12 divisors (see below), whose sum is σ = 38956960. Its totient is φ = 9540432.

The previous prime is 20670983. The next prime is 20670989. The reversal of 20670988 is 88907602.

It is a super-2 number, since 2×20670988² = 854579489792288, which contains 22 as substring.

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 20670988.

It is not an unprimeable number, because it can be changed into a prime (20670983) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 198708 + ... + 198811.

Almost surely, 2^20670988 is an apocalyptic number.

It is an amenable number.

20670988 is a deficient number, since it is larger than the sum of its proper divisors (18285972).

20670988 is a wasteful number, since it uses less digits than its factorization.

20670988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 397536 (or 397534 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 40.

The square root of 20670988 is about 4546.5358241193. The cubic root of 20670988 is about 274.4440028088. Note that the first 3 decimals are identical.

The spelling of 20670988 in words is "twenty million, six hundred seventy thousand, nine hundred eighty-eight".