20561614 has 4 divisors (see below), whose sum is σ = 30842424. Its totient is φ = 10280806.

The previous prime is 20561599. The next prime is 20561621. The reversal of 20561614 is 41616502.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 41616502 = 2 ⋅20808251.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5140402 + ... + 5140405.

It is an arithmetic number, because the mean of its divisors is an integer number (7710606).

Almost surely, 2^20561614 is an apocalyptic number.

20561614 is a deficient number, since it is larger than the sum of its proper divisors (10280810).

20561614 is a wasteful number, since it uses less digits than its factorization.

20561614 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10280809.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 20561614 is about 4534.4915922295. The cubic root of 20561614 is about 273.9591019995.

The spelling of 20561614 in words is "twenty million, five hundred sixty-one thousand, six hundred fourteen".