20213690 has 16 divisors (see below), whose sum is σ = 41582592. Its totient is φ = 6930384.

The previous prime is 20213689. The next prime is 20213717. The reversal of 20213690 is 9631202.

It is a super-2 number, since 2×20213690² = 817186526832200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 144314 + ... + 144453.

It is an arithmetic number, because the mean of its divisors is an integer number (2598912).

Almost surely, 2^20213690 is an apocalyptic number.

20213690 is an abundant number, since it is smaller than the sum of its proper divisors (21368902).

20213690 is a wasteful number, since it uses less digits than its factorization.

20213690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 288781.

The product of its (nonzero) digits is 648, while the sum is 23.

The square root of 20213690 is about 4495.9637454054. The cubic root of 20213690 is about 272.4050787426.

Adding to 20213690 its reverse (9631202), we get a palindrome (29844892).

The spelling of 20213690 in words is "twenty million, two hundred thirteen thousand, six hundred ninety".