20764418 has 4 divisors (see below), whose sum is σ = 31146630. Its totient is φ = 10382208.

The previous prime is 20764369. The next prime is 20764421. The reversal of 20764418 is 81446702.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 18258529 + 2505889 = 4273^2 + 1583^2 .

It is a super-2 number, since 2×20764418² = 862322109757448, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5191103 + ... + 5191106.

Almost surely, 2^20764418 is an apocalyptic number.

20764418 is a deficient number, since it is larger than the sum of its proper divisors (10382212).

20764418 is a wasteful number, since it uses less digits than its factorization.

20764418 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10382211.

The product of its (nonzero) digits is 10752, while the sum is 32.

The square root of 20764418 is about 4556.7990958567. The cubic root of 20764418 is about 274.8568643548.

The spelling of 20764418 in words is "twenty million, seven hundred sixty-four thousand, four hundred eighteen".