20605377 has 16 divisors (see below), whose sum is σ = 31328640. Its totient is φ = 11933952.

The previous prime is 20605349. The next prime is 20605391. The reversal of 20605377 is 77350602.

It is not a de Polignac number, because 20605377 - 2¹⁵ = 20572609 is a prime.

It is a super-2 number, since 2×20605377² = 849163122624258, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20605327) 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, 14877 + ... + 16202.

It is an arithmetic number, because the mean of its divisors is an integer number (1958040).

Almost surely, 2^20605377 is an apocalyptic number.

It is an amenable number.

20605377 is a deficient number, since it is larger than the sum of its proper divisors (10723263).

20605377 is a wasteful number, since it uses less digits than its factorization.

20605377 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31112.

The product of its (nonzero) digits is 8820, while the sum is 30.

The square root of 20605377 is about 4539.3145958393. The cubic root of 20605377 is about 274.1533276134.

Adding to 20605377 its reverse (77350602), we get a palindrome (97955979).

The spelling of 20605377 in words is "twenty million, six hundred five thousand, three hundred seventy-seven".