20301690 has 32 divisors (see below), whose sum is σ = 51289920. Its totient is φ = 5128704.

The previous prime is 20301647. The next prime is 20301691. The reversal of 20301690 is 9610302.

It is a super-2 number, since 2×20301690² = 824317233712200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20301691) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17239 + ... + 18378.

It is an arithmetic number, because the mean of its divisors is an integer number (1602810).

Almost surely, 2^20301690 is an apocalyptic number.

20301690 is an abundant number, since it is smaller than the sum of its proper divisors (30988230).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20301690 is a wasteful number, since it uses less digits than its factorization.

20301690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35646.

The product of its (nonzero) digits is 324, while the sum is 21.

The square root of 20301690 is about 4505.7396729061. The cubic root of 20301690 is about 272.7998103014.

Adding to 20301690 its reverse (9610302), we get a palindrome (29911992).

The spelling of 20301690 in words is "twenty million, three hundred one thousand, six hundred ninety".