20306377 has 24 divisors (see below), whose sum is σ = 25843776. Its totient is φ = 15536448.

The previous prime is 20306369. The next prime is 20306387. The reversal of 20306377 is 77360302.

It is not a de Polignac number, because 20306377 - 2³ = 20306369 is a prime.

It is a super-2 number, since 2×20306377² = 824697893732258, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20306327) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 124498 + ... + 124660.

It is an arithmetic number, because the mean of its divisors is an integer number (1076824).

Almost surely, 2^20306377 is an apocalyptic number.

It is an amenable number.

20306377 is a deficient number, since it is larger than the sum of its proper divisors (5537399).

20306377 is a wasteful number, since it uses less digits than its factorization.

20306377 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 257 (or 220 counting only the distinct ones).

The product of its (nonzero) digits is 5292, while the sum is 28.

The square root of 20306377 is about 4506.2597572710. The cubic root of 20306377 is about 272.8208022209.

Adding to 20306377 its reverse (77360302), we get a palindrome (97666679).

The spelling of 20306377 in words is "twenty million, three hundred six thousand, three hundred seventy-seven".