20507465 has 16 divisors (see below), whose sum is σ = 26934336. Its totient is φ = 14865600.

The previous prime is 20507429. The next prime is 20507471. The reversal of 20507465 is 56470502.

It is not a de Polignac number, because 20507465 - 2⁶ = 20507401 is a prime.

It is a super-2 number, since 2×20507465² = 841112241452450, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31079 + ... + 31731.

It is an arithmetic number, because the mean of its divisors is an integer number (1683396).

Almost surely, 2^20507465 is an apocalyptic number.

It is an amenable number.

20507465 is a deficient number, since it is larger than the sum of its proper divisors (6426871).

20507465 is a wasteful number, since it uses less digits than its factorization.

20507465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1240.

The product of its (nonzero) digits is 8400, while the sum is 29.

The square root of 20507465 is about 4528.5168653766. The cubic root of 20507465 is about 273.7184001945.

Adding to 20507465 its reverse (56470502), we get a palindrome (76977967).

The spelling of 20507465 in words is "twenty million, five hundred seven thousand, four hundred sixty-five".