20751772 has 24 divisors (see below), whose sum is σ = 37844352. Its totient is φ = 9945600.

The previous prime is 20751767. The next prime is 20751817. The reversal of 20751772 is 27715702.

It is a super-2 number, since 2×20751772² = 861272082279968, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 13272 + ... + 14752.

It is an arithmetic number, because the mean of its divisors is an integer number (1576848).

Almost surely, 2^20751772 is an apocalyptic number.

It is an amenable number.

20751772 is a deficient number, since it is larger than the sum of its proper divisors (17092580).

20751772 is a wasteful number, since it uses less digits than its factorization.

20751772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1629 (or 1627 counting only the distinct ones).

The product of its (nonzero) digits is 6860, while the sum is 31.

The square root of 20751772 is about 4555.4112876885. The cubic root of 20751772 is about 274.8010550087.

The spelling of 20751772 in words is "twenty million, seven hundred fifty-one thousand, seven hundred seventy-two".