20276661 has 4 divisors (see below), whose sum is σ = 27035552. Its totient is φ = 13517772.

The previous prime is 20276657. The next prime is 20276689. The reversal of 20276661 is 16667202.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 20276661 - 2² = 20276657 is a prime.

It is a super-2 number, since 2×20276661² = 822285962617842, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20276611) 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, 3379441 + ... + 3379446.

It is an arithmetic number, because the mean of its divisors is an integer number (6758888).

Almost surely, 2^20276661 is an apocalyptic number.

It is an amenable number.

20276661 is a deficient number, since it is larger than the sum of its proper divisors (6758891).

20276661 is an equidigital number, since it uses as much as digits as its factorization.

20276661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6758890.

The product of its (nonzero) digits is 6048, while the sum is 30.

The square root of 20276661 is about 4502.9613589281. The cubic root of 20276661 is about 272.6876568417.

The spelling of 20276661 in words is "twenty million, two hundred seventy-six thousand, six hundred sixty-one".