20670538 has 16 divisors (see below), whose sum is σ = 37520064. Its totient is φ = 8337600.

The previous prime is 20670523. The next prime is 20670547. The reversal of 20670538 is 83507602.

It is a super-2 number, since 2×20670538² = 854542282418888, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43188 + ... + 43663.

It is an arithmetic number, because the mean of its divisors is an integer number (2345004).

Almost surely, 2^20670538 is an apocalyptic number.

20670538 is a deficient number, since it is larger than the sum of its proper divisors (16849526).

20670538 is a wasteful number, since it uses less digits than its factorization.

20670538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86877.

The product of its (nonzero) digits is 10080, while the sum is 31.

The square root of 20670538 is about 4546.4863356223. The cubic root of 20670538 is about 274.4420112785.

The spelling of 20670538 in words is "twenty million, six hundred seventy thousand, five hundred thirty-eight".