20697958 has 4 divisors (see below), whose sum is σ = 31046940. Its totient is φ = 10348978.

The previous prime is 20697923. The next prime is 20697977. The reversal of 20697958 is 85979602.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 85979602 = 2 ⋅42989801.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5174488 + ... + 5174491.

It is an arithmetic number, because the mean of its divisors is an integer number (7761735).

Almost surely, 2^20697958 is an apocalyptic number.

20697958 is a deficient number, since it is larger than the sum of its proper divisors (10348982).

20697958 is a wasteful number, since it uses less digits than its factorization.

20697958 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10348981.

The product of its (nonzero) digits is 272160, while the sum is 46.

The square root of 20697958 is about 4549.5008517419. The cubic root of 20697958 is about 274.5633091203.

The spelling of 20697958 in words is "twenty million, six hundred ninety-seven thousand, nine hundred fifty-eight".