20513377 has 8 divisors (see below), whose sum is σ = 20983040. Its totient is φ = 20049120.

The previous prime is 20513371. The next prime is 20513393. The reversal of 20513377 is 77331502.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20513377 - 2¹⁵ = 20480609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20513371) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6877 + ... + 9397.

It is an arithmetic number, because the mean of its divisors is an integer number (2622880).

Almost surely, 2^20513377 is an apocalyptic number.

It is an amenable number.

20513377 is a deficient number, since it is larger than the sum of its proper divisors (469663).

20513377 is a wasteful number, since it uses less digits than its factorization.

20513377 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2703.

The product of its (nonzero) digits is 4410, while the sum is 28.

The square root of 20513377 is about 4529.1695706829. The cubic root of 20513377 is about 273.7447006612.

Adding to 20513377 its reverse (77331502), we get a palindrome (97844879).

The spelling of 20513377 in words is "twenty million, five hundred thirteen thousand, three hundred seventy-seven".