20692778 has 16 divisors (see below), whose sum is σ = 32693760. Its totient is φ = 9803376.

The previous prime is 20692769. The next prime is 20692783. The reversal of 20692778 is 87729602.

It is a super-2 number, since 2×20692778² = 856382122714568, which contains 22 as substring.

It is a Curzon number.

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, 2951 + ... + 7077.

It is an arithmetic number, because the mean of its divisors is an integer number (2043360).

Almost surely, 2^20692778 is an apocalyptic number.

20692778 is a deficient number, since it is larger than the sum of its proper divisors (12000982).

20692778 is a wasteful number, since it uses less digits than its factorization.

20692778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4261.

The product of its (nonzero) digits is 84672, while the sum is 41.

The square root of 20692778 is about 4548.9315228963. The cubic root of 20692778 is about 274.5404025675.

The spelling of 20692778 in words is "twenty million, six hundred ninety-two thousand, seven hundred seventy-eight".