20012690 has 8 divisors (see below), whose sum is σ = 36022860. Its totient is φ = 8005072.

The previous prime is 20012687. The next prime is 20012743. The reversal of 20012690 is 9621002.

It can be written as a sum of positive squares in 2 ways, for example, as 19651489 + 361201 = 4433^2 + 601^2 .

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

It is a super-2 number, since 2×20012690² = 801015522072200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1000625 + ... + 1000644.

Almost surely, 2^20012690 is an apocalyptic number.

20012690 is a deficient number, since it is larger than the sum of its proper divisors (16010170).

20012690 is a wasteful number, since it uses less digits than its factorization.

20012690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2001276.

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 20012690 is about 4473.5545151479. The cubic root of 20012690 is about 271.4991594542.

Adding to 20012690 its reverse (9621002), we get a palindrome (29633692).

It can be divided in two parts, 20012 and 690, that added together give a palindrome (20702).

The spelling of 20012690 in words is "twenty million, twelve thousand, six hundred ninety".