20273661 has 6 divisors (see below), whose sum is σ = 29284190. Its totient is φ = 13515768.

The previous prime is 20273651. The next prime is 20273681. The reversal of 20273661 is 16637202.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 13461561 + 6812100 = 3669^2 + 2610^2 .

It is not a de Polignac number, because 20273661 - 2²³ = 11885053 is a prime.

It is a super-2 number, since 2×20273661² = 822042660685842, 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 (20273641) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1126306 + ... + 1126323.

Almost surely, 2^20273661 is an apocalyptic number.

It is an amenable number.

20273661 is a deficient number, since it is larger than the sum of its proper divisors (9010529).

20273661 is a wasteful number, since it uses less digits than its factorization.

20273661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2252635 (or 2252632 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 27.

The square root of 20273661 is about 4502.6282324882. The cubic root of 20273661 is about 272.6742078273.

The spelling of 20273661 in words is "twenty million, two hundred seventy-three thousand, six hundred sixty-one".