20770156 has 24 divisors (see below), whose sum is σ = 40045824. Its totient is φ = 9347280.

The previous prime is 20770147. The next prime is 20770163. The reversal of 20770156 is 65107702.

It is a hoax number, since the sum of its digits (28) coincides with the sum of the digits of its distinct prime factors.

It is a congruent 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, 2241 + ... + 6823.

It is an arithmetic number, because the mean of its divisors is an integer number (1668576).

Almost surely, 2^20770156 is an apocalyptic number.

It is an amenable number.

20770156 is a deficient number, since it is larger than the sum of its proper divisors (19275668).

20770156 is a wasteful number, since it uses less digits than its factorization.

20770156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4701 (or 4699 counting only the distinct ones).

The product of its (nonzero) digits is 2940, while the sum is 28.

The square root of 20770156 is about 4557.4286609886. The cubic root of 20770156 is about 274.8821798317.

Adding to 20770156 its reverse (65107702), we get a palindrome (85877858).

The spelling of 20770156 in words is "twenty million, seven hundred seventy thousand, one hundred fifty-six".