20697730 has 8 divisors (see below), whose sum is σ = 37255932. Its totient is φ = 8279088.

The previous prime is 20697713. The next prime is 20697737. The reversal of 20697730 is 3779602.

It can be written as a sum of positive squares in 2 ways, for example, as 20223009 + 474721 = 4497^2 + 689^2 .

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

It is not an unprimeable number, because it can be changed into a prime (20697737) 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, 1034877 + ... + 1034896.

Almost surely, 2^20697730 is an apocalyptic number.

20697730 is a deficient number, since it is larger than the sum of its proper divisors (16558202).

20697730 is a wasteful number, since it uses less digits than its factorization.

20697730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2069780.

The product of its (nonzero) digits is 15876, while the sum is 34.

The square root of 20697730 is about 4549.4757939789. The cubic root of 20697730 is about 274.5623009586.

The spelling of 20697730 in words is "twenty million, six hundred ninety-seven thousand, seven hundred thirty".